[PATCH net v3 0/3] ieee802154: ca8210: fix stack and slab out-of-bounds accesses

[PATCH net v3 0/3] ieee802154: ca8210: fix stack and slab out-of-bounds accesses

[Hui Peng]

This series fixes three out-of-bounds access bugs in the Cascoda CA8210
IEEE 802.15.4 driver:

1. Reject received SPI packets with len > sizeof(struct mac_message) in
   ca8210_rx_done() instead of checking len > CA8210_SPI_BUF_SIZE (256),
   preventing a stack buffer overflow when copying a synchronous response
   into priv->sync_command_response (a struct mac_message on the caller's
   stack) and matching the actual SPI transfer length
   (cas_ctl->transfer.len = sizeof(struct mac_message)).
2. Initialize lenvar = 1 in ca8210_get_ed() and validate
   hw_attribute_length against *hw_attribute_length in
   hwme_get_request_sync() before memcpy() to prevent overflowing the
   caller's stack buffer.
3. Validate the received SPI frame length len upfront at the start of
   ca8210_skb_rx() before reading data_ind or allocating the skb.

Changes in v3:
- Patch 1/3: Check len > sizeof(struct mac_message) in ca8210_rx_done()
  where dev_crit() logs "Received packet len (%u) erroneously long" and
  drops the packet, instead of silently truncating the memcpy() with
  min_t(), addressing David Laight's feedback.

Changes in v2:
- Split the ca8210 fixes into three single-issue patches (1/3..3/3) and
  addressed Miquel Raynal's review comments on patches 2/3 and 3/3.

Hui Peng (3):
  ieee802154: ca8210: prevent stack buffer overflow in ca8210_rx_done()
  ieee802154: ca8210: prevent stack buffer overflow in
    hwme_get_request_sync()
  ieee802154: ca8210: validate data_ind length upfront in
    ca8210_skb_rx()

 drivers/net/ieee802154/ca8210.c | 39 +++++++++++++++++++++++----------
 1 file changed, 27 insertions(+), 12 deletions(-)

-- 
2.49.0

[PATCH net v3 1/3] ieee802154: ca8210: prevent stack buffer overflow in ca8210_rx_done()

[Hui Peng]

In ca8210_spi_transfer(), each SPI transfer reads
sizeof(struct mac_message) bytes into cas_ctl->tx_in_buf:

  cas_ctl->transfer.len = sizeof(struct mac_message);

However, ca8210_rx_done() only checks the received packet length
len = buf[1] + 2 against CA8210_SPI_BUF_SIZE (256). When buf[0] & SPI_SYN
is set and priv->sync_command_response is non-NULL, memcpy() copies up to
256 bytes into priv->sync_command_response, which points to a
struct mac_message object on the synchronous caller's stack, overflowing
the stack buffer:

  BUG: KASAN: stack-out-of-bounds in ca8210_rx_done+0x117/0x6c0
  Write of size 256 at addr ffff8881009e7c40 by task swapper/0/1
  Call Trace:
   <TASK>
   dump_stack_lvl+0x70/0xa0
   print_report+0x153/0x4c6
   kasan_report+0xf1/0x120
   kasan_check_range+0x125/0x200
   __asan_memcpy+0x3c/0x60
   ca8210_rx_done+0x117/0x6c0
  ...
  This frame has 1 object:
   [32, 182) 'response'

Check len > sizeof(struct mac_message) instead of
len > CA8210_SPI_BUF_SIZE in ca8210_rx_done() so that any packet exceeding
sizeof(struct mac_message) is logged as erroneously long via dev_crit()
and dropped before copying into priv->sync_command_response or passing it
to ca8210_net_rx().

Tested in QEMU with KASAN enabled by passing a 256-byte SPI_SYN response
into ca8210_rx_done().

Fixes: ded845a781a5 ("ieee802154: Add CA8210 IEEE 802.15.4 device driver")
Cc: stable@vger.kernel.org
Assisted-by: LLM
Signed-off-by: Hui Peng <benquike@gmail.com>
---
Changes in v3:
- Check len > sizeof(struct mac_message) at the top of ca8210_rx_done()
  where dev_crit() logs the error and drops the packet instead of silently
  truncating memcpy() with min_t(), addressing David Laight's feedback.

Changes in v2:
- Split the ca8210 fixes into three single-issue patches (1/3..3/3).

 drivers/net/ieee802154/ca8210.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/ieee802154/ca8210.c b/drivers/net/ieee802154/ca8210.c
index 01af4f9..a990a0f 100644
--- a/drivers/net/ieee802154/ca8210.c
+++ b/drivers/net/ieee802154/ca8210.c
@@ -686,7 +686,7 @@ static void ca8210_rx_done(struct cas_control *cas_ctl)
 
 	buf = cas_ctl->tx_in_buf;
 	len = buf[1] + 2;
-	if (len > CA8210_SPI_BUF_SIZE) {
+	if (len > sizeof(struct mac_message)) {
 		dev_crit(
 			&priv->spi->dev,
 			"Received packet len (%u) erroneously long\n",
-- 
2.49.0

[PATCH net v3 2/3] ieee802154: ca8210: prevent stack buffer overflow in hwme_get_request_sync()

[Hui Peng]

In ca8210_get_ed(), an uninitialized u8 lenvar and a pointer to a 1-byte
stack buffer (u8 *level) are passed to hwme_get_request_sync(), which
unconditionally copies response.pdata.hwme_get_cnf.hw_attribute_length
bytes into hw_attribute_value without checking the caller's destination
buffer capacity, overflowing level on the stack when hw_attribute_length
exceeds 1:

  BUG: KASAN: stack-out-of-bounds in hwme_get_request_sync.constprop.0.isra.0+0xf3/0x170
  Write of size 16 at addr ffff888001907780 by task init/1
  Call Trace:
   <TASK>
   dump_stack_lvl+0x70/0xa0
   print_report+0x153/0x4c6
   kasan_report+0xf1/0x120
   kasan_check_range+0x125/0x200
   __asan_memcpy+0x3c/0x60
   hwme_get_request_sync.constprop.0.isra.0+0xf3/0x170
   ca8210_get_ed+0x9c/0xf0
  ...
  The buggy address belongs to stack of task init/1
   and is located at offset 48 in frame:
   ca8210_get_ed+0x0/0xf0
  This frame has 2 objects:
   [48, 49) 'level'
   [64, 65) 'lenvar'

Initialize lenvar = 1 in ca8210_get_ed() and return
IEEE802154_SYSTEM_ERROR in hwme_get_request_sync() if
response.pdata.hwme_get_cnf.hw_attribute_length exceeds
*hw_attribute_length.

Tested in QEMU with KASAN enabled by passing an oversized
hw_attribute_length response into ca8210_get_ed().

Fixes: ded845a781a5 ("ieee802154: Add CA8210 IEEE 802.15.4 device driver")
Cc: stable@vger.kernel.org
Assisted-by: LLM
Signed-off-by: Hui Peng <benquike@gmail.com>
---
Changes in v3:
- No changes.

Changes in v2:
- Split out as patch 2/3.
- Replaced the temporary stack buffer in ca8210_get_ed() with lenvar = 1
  and an upper-bound check against *hw_attribute_length in
  hwme_get_request_sync() as requested by Miquel Raynal.

 drivers/net/ieee802154/ca8210.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ieee802154/ca8210.c b/drivers/net/ieee802154/ca8210.c
index a990a0f..8aa7ffe 100644
--- a/drivers/net/ieee802154/ca8210.c
+++ b/drivers/net/ieee802154/ca8210.c
@@ -1677,6 +1677,9 @@ static u8 hwme_get_request_sync(
 		return IEEE802154_SYSTEM_ERROR;
 
 	if (response.pdata.hwme_get_cnf.status == IEEE802154_SUCCESS) {
+		if (response.pdata.hwme_get_cnf.hw_attribute_length >
+		    *hw_attribute_length)
+			return IEEE802154_SYSTEM_ERROR;
 		*hw_attribute_length =
 			response.pdata.hwme_get_cnf.hw_attribute_length;
 		memcpy(
@@ -2027,7 +2030,7 @@ static int ca8210_xmit_async(struct ieee802154_hw *hw, struct sk_buff *skb)
  */
 static int ca8210_get_ed(struct ieee802154_hw *hw, u8 *level)
 {
-	u8 lenvar;
+	u8 lenvar = 1;
 	struct ca8210_priv *priv = hw->priv;
 
 	return link_to_linux_err(

[PATCH net v3 3/3] ieee802154: ca8210: validate data_ind length upfront in ca8210_skb_rx()

[Hui Peng]

In ca8210_skb_rx(), data_ind is read at offsets 22 (msdulen), 23
(mpdulinkquality), 29 + msdulen (hdr.sec.level), 30..39 + msdulen
(security header), and 29 .. 29 + msdulen (payload) without verifying
that the received SPI frame length len covers those offsets, causing an
out-of-bounds read when msdulen exceeds len - 30:

  BUG: KASAN: slab-out-of-bounds in ca8210_skb_rx.constprop.0.isra.0+0x137/0x160
  Read of size 64 at addr ffff888006453ddd by task init/1
  Call Trace:
   <TASK>
   dump_stack_lvl+0x70/0xa0
   print_report+0x153/0x4c6
   kasan_report+0xf1/0x120
   kasan_check_range+0x125/0x200
   __asan_memcpy+0x23/0x60
   ca8210_skb_rx.constprop.0.isra.0+0x137/0x160
   ca8210_net_rx+0x96/0xc0
  ...
  The buggy address belongs to the object at ffff888006453dc0
   which belongs to the cache kmalloc-32 of size 32
  The buggy address is located 29 bytes inside of
   allocated 32-byte region [ffff888006453dc0, ffff888006453de0)

Consolidate all length and msdulen validations into a single upfront check
at the beginning of ca8210_skb_rx() before allocating the skb.

Tested in QEMU with KASAN enabled by passing a short data_ind buffer with
msdulen = 64 and len = 30 into ca8210_skb_rx().

Fixes: ded845a781a5 ("ieee802154: Add CA8210 IEEE 802.15.4 device driver")
Cc: stable@vger.kernel.org
Assisted-by: LLM
Signed-off-by: Hui Peng <benquike@gmail.com>
---
Changes in v3:
- No changes.

Changes in v2:
- Split out as patch 3/3.
- Consolidated all length checks in ca8210_skb_rx() into a single place
  at the beginning of the function before dev_alloc_skb() and dropped the
  unrelated hdr.seq assignment as requested by Miquel Raynal.

 drivers/net/ieee802154/ca8210.c | 32 ++++++++++++++++++++++----------
 1 file changed, 22 insertions(+), 10 deletions(-)

diff --git a/drivers/net/ieee802154/ca8210.c b/drivers/net/ieee802154/ca8210.c
index 8aa7ffe..ab245ad 100644
--- a/drivers/net/ieee802154/ca8210.c
+++ b/drivers/net/ieee802154/ca8210.c
@@ -1758,19 +1758,15 @@ static int ca8210_skb_rx(
 	u8                    *data_ind
 )
 {
-	struct ieee802154_hdr hdr;
+	struct ieee802154_hdr hdr = { };
 	int msdulen;
 	int hlen;
-	u8 mpdulinkquality = data_ind[23];
+	u8 mpdulinkquality;
 	struct sk_buff *skb;
 	struct ca8210_priv *priv = hw->priv;
 
-	/* Allocate mtu size buffer for every rx packet */
-	skb = dev_alloc_skb(IEEE802154_MTU + sizeof(hdr));
-	if (!skb)
-		return -ENOMEM;
-
-	skb_reserve(skb, sizeof(hdr));
+	if (len < 30)
+		return -EMSGSIZE;
 
 	msdulen = data_ind[22]; /* msdu_length */
 	if (msdulen > IEEE802154_MTU) {
@@ -1778,9 +1774,25 @@ static int ca8210_skb_rx(
 			&priv->spi->dev,
 			"received erroneously large msdu length!\n"
 		);
-		kfree_skb(skb);
 		return -EMSGSIZE;
 	}
+
+	if (len < 30 + msdulen ||
+	    (!priv->promiscuous && data_ind[29 + msdulen] > 0 &&
+	     len < 29 + msdulen + sizeof(struct secspec))) {
+		dev_err(&priv->spi->dev,
+			"received truncated data indication!\n");
+		return -EMSGSIZE;
+	}
+
+	mpdulinkquality = data_ind[23];
+
+	/* Allocate mtu size buffer for every rx packet */
+	skb = dev_alloc_skb(IEEE802154_MTU + sizeof(hdr));
+	if (!skb)
+		return -ENOMEM;
+
+	skb_reserve(skb, sizeof(hdr));
 	dev_dbg(&priv->spi->dev, "skb buffer length = %d\n", msdulen);
 
 	if (priv->promiscuous)

Re: [PATCH net v3 2/3] ieee802154: ca8210: prevent stack buffer overflow in hwme_get_request_sync()

[netdev-bot+sashiko]

Thank you for your contribution! Sashiko AI review found more severe
issue(s) in other patches of this series. This mail is only an FYI, in case
you want to address the nit picks below when you respin.

Low priority / nit picks for your consideration:

- [Low] hwme_get_request_sync() (drivers/net/ieee802154/ca8210.c:1655) is
  changed so that *hw_attribute_length becomes a mandatory *input*: line…

Pre-existing issues:
- [Medium] hwme_get_request_sync() validates the device-reported
  hw_attribute_length only from above; it never checks that the confirm…

--

ieee802154: ca8210: prevent stack buffer overflow in hwme_get_request_sync()

The patch turns the hw_attribute_length argument of
hwme_get_request_sync() into an in/out parameter: the caller-supplied
value is now used as the capacity of the destination buffer, and an
over-long HWME-GET.confirm is rejected with IEEE802154_SYSTEM_ERROR.
The single caller ca8210_get_ed() initialises lenvar to 1 to match the
one-byte level buffer.

> diff --git a/drivers/net/ieee802154/ca8210.c b/drivers/net/ieee802154/ca8210.c
> index a990a0f347ad8..8aa7ffeb22d78 100644
> --- a/drivers/net/ieee802154/ca8210.c
> +++ b/drivers/net/ieee802154/ca8210.c
> @@ -1677,6 +1677,9 @@ static u8 hwme_get_request_sync(
>  		return IEEE802154_SYSTEM_ERROR;
>  
>  	if (response.pdata.hwme_get_cnf.status == IEEE802154_SUCCESS) {
> +		if (response.pdata.hwme_get_cnf.hw_attribute_length >
> +		    *hw_attribute_length)
> +			return IEEE802154_SYSTEM_ERROR;

[Severity: Low]
This isn't a bug, but should the kernel-doc above hwme_get_request_sync()
be updated to describe the new contract?  The block still reads:

  /**
   * hwme_get_request_sync() - HWME_GET_request/confirm according to API Spec
   * @hw_attribute:        Attribute Number
   * @hw_attribute_length: Attribute length
   * @hw_attribute_value:  Pointer to Attribute Value
   * @device_ref:          Nondescript pointer to target device
   *
   * Return: 802.15.4 status code of HWME-GET.confirm
   */

The @hw_attribute_length wording is word for word the same as the one used
for hwme_set_request_sync(), where the parameter really is a plain input
value, and the Return: line no longer covers the new
IEEE802154_SYSTEM_ERROR case for an over-long reply.

A second call site that follows the current wording and passes the expected
attribute length (or leaves the variable uninitialised, as ca8210_get_ed()
did before this patch) would either reintroduce the overflow being fixed
here or make every valid reply fail.  Would it help to document that the
caller must pass sizeof(destination buffer) on entry and receives the number
of bytes written on return?

>  		*hw_attribute_length =
>  			response.pdata.hwme_get_cnf.hw_attribute_length;

[Severity: Medium]
This is a pre-existing issue and not introduced by this patch, but since the
new check sits exactly where a length test belongs: should there also be a
lower-bound or consistency check here?

Only over-long lengths are rejected, so a confirm with
status == IEEE802154_SUCCESS and hw_attribute_length == 0 passes, copies
zero bytes and returns IEEE802154_SUCCESS:

drivers/net/ieee802154/ca8210.c:ca8210_get_ed() {
	u8 lenvar = 1;
	...
	return link_to_linux_err(
		hwme_get_request_sync(HWME_EDVALUE, &lenvar, level, priv->spi)
	);
}

The returned lenvar is ignored, so ca8210_get_ed() reports 0 while *level
was never written, although struct ieee802154_ops.ed in
include/net/mac802154.h expects the callback to store the measured energy.

There is a related case for a short confirm.  'struct mac_message response'
in hwme_get_request_sync() is an uninitialised stack object, and
ca8210_rx_done() only enforces an upper bound before copying:

drivers/net/ieee802154/ca8210.c:ca8210_rx_done() {
	buf = cas_ctl->tx_in_buf;
	len = buf[1] + 2;
	if (len > sizeof(struct mac_message)) {
		...
		goto finish;
	}

	if (buf[0] & SPI_SYN) {
		if (priv->sync_command_response) {
			memcpy(priv->sync_command_response, buf, len);
	...
}

If the device answers SPI_HWME_GET_CONFIRM with a length byte that stops
before the attribute bytes, response.pdata.hwme_get_cnf.hw_attribute_length
and hw_attribute_value keep whatever was on the stack.  When that stale
length happens to be 0 or 1 the new check passes, and a stale stack byte is
copied into *level while success is returned.  Would an exact length test
for the fixed-width HWME_EDVALUE attribute, plus a check that the confirmed
attribute length fits within response.length, close both cases?

In the current tree neither variant is reachable from userspace, since ->ed
has no in-tree caller (net/mac802154/main.c only checks for its presence
with a WARN_ON, and ED scans are refused in net/mac802154/scan.c).

-- 
Sashiko AI review · https://netdev-ai.bots.linux.dev/sashiko/#/patchset/20260922093126.141969-1-benquike%40gmail.com

Re: [PATCH net v3 2/3] ieee802154: ca8210: prevent stack buffer overflow in hwme_get_request_sync()

[David Laight]

On Tue, 22 Sep 2026 09:30:24 +0000
Hui Peng <benquike@gmail.com> wrote:

> In ca8210_get_ed(), an uninitialized u8 lenvar and a pointer to a 1-byte
> stack buffer (u8 *level) are passed to hwme_get_request_sync(), which
> unconditionally copies response.pdata.hwme_get_cnf.hw_attribute_length
> bytes into hw_attribute_value without checking the caller's destination
> buffer capacity, overflowing level on the stack when hw_attribute_length
> exceeds 1:
> 
>   BUG: KASAN: stack-out-of-bounds in hwme_get_request_sync.constprop.0.isra.0+0xf3/0x170
>   Write of size 16 at addr ffff888001907780 by task init/1
>   Call Trace:
>    <TASK>
>    dump_stack_lvl+0x70/0xa0
>    print_report+0x153/0x4c6
>    kasan_report+0xf1/0x120
>    kasan_check_range+0x125/0x200
>    __asan_memcpy+0x3c/0x60
>    hwme_get_request_sync.constprop.0.isra.0+0xf3/0x170
>    ca8210_get_ed+0x9c/0xf0
>   ...
>   The buggy address belongs to stack of task init/1
>    and is located at offset 48 in frame:
>    ca8210_get_ed+0x0/0xf0
>   This frame has 2 objects:
>    [48, 49) 'level'
>    [64, 65) 'lenvar'
> 
> Initialize lenvar = 1 in ca8210_get_ed() and return
> IEEE802154_SYSTEM_ERROR in hwme_get_request_sync() if
> response.pdata.hwme_get_cnf.hw_attribute_length exceeds
> *hw_attribute_length.

This function is silly.
There is exactly one caller, the only valid length seems to 1 (is zero valid?),
not much point using memcpy() either.

David

> 
> Tested in QEMU with KASAN enabled by passing an oversized
> hw_attribute_length response into ca8210_get_ed().
> 
> Fixes: ded845a781a5 ("ieee802154: Add CA8210 IEEE 802.15.4 device driver")
> Cc: stable@vger.kernel.org
> Assisted-by: LLM
> Signed-off-by: Hui Peng <benquike@gmail.com>
> ---
> Changes in v3:
> - No changes.
> 
> Changes in v2:
> - Split out as patch 2/3.
> - Replaced the temporary stack buffer in ca8210_get_ed() with lenvar = 1
>   and an upper-bound check against *hw_attribute_length in
>   hwme_get_request_sync() as requested by Miquel Raynal.
> 
>  drivers/net/ieee802154/ca8210.c | 5 ++++-
>  1 file changed, 4 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/net/ieee802154/ca8210.c b/drivers/net/ieee802154/ca8210.c
> index a990a0f..8aa7ffe 100644
> --- a/drivers/net/ieee802154/ca8210.c
> +++ b/drivers/net/ieee802154/ca8210.c
> @@ -1677,6 +1677,9 @@ static u8 hwme_get_request_sync(
>  		return IEEE802154_SYSTEM_ERROR;
>  
>  	if (response.pdata.hwme_get_cnf.status == IEEE802154_SUCCESS) {
> +		if (response.pdata.hwme_get_cnf.hw_attribute_length >
> +		    *hw_attribute_length)
> +			return IEEE802154_SYSTEM_ERROR;
>  		*hw_attribute_length =
>  			response.pdata.hwme_get_cnf.hw_attribute_length;
>  		memcpy(
> @@ -2027,7 +2030,7 @@ static int ca8210_xmit_async(struct ieee802154_hw *hw, struct sk_buff *skb)
>   */
>  static int ca8210_get_ed(struct ieee802154_hw *hw, u8 *level)
>  {
> -	u8 lenvar;
> +	u8 lenvar = 1;
>  	struct ca8210_priv *priv = hw->priv;
>  
>  	return link_to_linux_err(

[PATCH net v3 2/3] ieee802154: ca8210: prevent stack buffer overflow in hwme_get_request_sync()

[Hui Peng]

In ca8210_get_ed(), an uninitialized u8 lenvar and a pointer to a 1-byte
stack buffer (u8 *level) are passed to hwme_get_request_sync(), which
unconditionally copies response.pdata.hwme_get_cnf.hw_attribute_length
bytes into hw_attribute_value without checking the caller's destination
buffer capacity, overflowing level on the stack when hw_attribute_length
exceeds 1:

  BUG: KASAN: stack-out-of-bounds in hwme_get_request_sync.constprop.0.isra.0+0xf3/0x170
  Write of size 16 at addr ffff888001907780 by task init/1
  Call Trace:
   <TASK>
   dump_stack_lvl+0x70/0xa0
   print_report+0x153/0x4c6
   kasan_report+0xf1/0x120
   kasan_check_range+0x125/0x200
   __asan_memcpy+0x3c/0x60
   hwme_get_request_sync.constprop.0.isra.0+0xf3/0x170
   ca8210_get_ed+0x9c/0xf0
  ...
  The buggy address belongs to stack of task init/1
   and is located at offset 48 in frame:
   ca8210_get_ed+0x0/0xf0
  This frame has 2 objects:
   [48, 49) 'level'
   [64, 65) 'lenvar'

Initialize lenvar = 1 in ca8210_get_ed() and return
IEEE802154_SYSTEM_ERROR in hwme_get_request_sync() if
response.pdata.hwme_get_cnf.hw_attribute_length exceeds
*hw_attribute_length.

Tested in QEMU with KASAN enabled by passing an oversized
hw_attribute_length response into ca8210_get_ed().

Fixes: ded845a781a5 ("ieee802154: Add CA8210 IEEE 802.15.4 device driver")
Cc: stable@vger.kernel.org
Assisted-by: LLM
Signed-off-by: Hui Peng <benquike@gmail.com>
---
Changes in v3:
- No changes.

Changes in v2:
- Split out as patch 2/3.
- Replaced the temporary stack buffer in ca8210_get_ed() with lenvar = 1
  and an upper-bound check against *hw_attribute_length in
  hwme_get_request_sync() as requested by Miquel Raynal.

 drivers/net/ieee802154/ca8210.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ieee802154/ca8210.c b/drivers/net/ieee802154/ca8210.c
index a990a0f..8aa7ffe 100644
--- a/drivers/net/ieee802154/ca8210.c
+++ b/drivers/net/ieee802154/ca8210.c
@@ -1677,6 +1677,9 @@ static u8 hwme_get_request_sync(
 		return IEEE802154_SYSTEM_ERROR;
 
 	if (response.pdata.hwme_get_cnf.status == IEEE802154_SUCCESS) {
+		if (response.pdata.hwme_get_cnf.hw_attribute_length >
+		    *hw_attribute_length)
+			return IEEE802154_SYSTEM_ERROR;
 		*hw_attribute_length =
 			response.pdata.hwme_get_cnf.hw_attribute_length;
 		memcpy(
@@ -2027,7 +2030,7 @@ static int ca8210_xmit_async(struct ieee802154_hw *hw, struct sk_buff *skb)
  */
 static int ca8210_get_ed(struct ieee802154_hw *hw, u8 *level)
 {
-	u8 lenvar;
+	u8 lenvar = 1;
 	struct ca8210_priv *priv = hw->priv;
 
 	return link_to_linux_err(
-- 
2.49.0