[PATCH ath-next 0/2] wifi: ath: fix stride mismatch in mac_phy_caps_parse

[PATCH ath-next 0/2] wifi: ath: fix stride mismatch in mac_phy_caps_parse

[Jeff Johnson]

Both ath11k and ath12k have the same issue.

---
Jeff Johnson (2):
      wifi: ath12k: fix stride mismatch in mac_phy_caps_parse()
      wifi: ath11k: fix stride mismatch in mac_phy_caps_parse()

 drivers/net/wireless/ath/ath11k/wmi.c | 8 +++++---
 drivers/net/wireless/ath/ath12k/wmi.c | 8 +++++---
 2 files changed, 10 insertions(+), 6 deletions(-)
---
base-commit: 189721a4afa1804315e7dcfca9ca0539c7b1d7af
change-id: 20260720-mac_phy_caps_parse-stride-mismatch-e7292580f072

[PATCH ath-next 1/2] wifi: ath12k: fix stride mismatch in mac_phy_caps_parse()

[Jeff Johnson]

Currently, in ath12k_wmi_mac_phy_caps_parse(), kzalloc() sizes the
mac_phy_caps buffer as tot_phy_id * len, where len is clamped to
min(firmware_len, sizeof(struct ath12k_wmi_mac_phy_caps_params)). The
subsequent memcpy() destination advances by sizeof(full struct) per slot
via C pointer arithmetic, not by the clamped len. When firmware sends
short TLVs, the second and later slots are written past the end of the
allocation.

The reader in ath12k_pull_mac_phy_cap_svc_ready_ext() also indexes the
buffer with full-struct pointer arithmetic, so the allocation must match
that stride.

Fix by using kzalloc_objs(), which derives the element size from the
pointer type, making allocation size and pointer stride provably
consistent regardless of what len the firmware provides.

Tested-on: WCN7850 hw2.0 PCI WLAN.HMT.1.1.c7-00108-QCAHMTSWPL_V1.0_V2.0_SILICONZ_UPSTREAM-3

Fixes: d889913205cf ("wifi: ath12k: driver for Qualcomm Wi-Fi 7 devices")
Assisted-by: Claude:claude-sonnet-4-6
Signed-off-by: Jeff Johnson <jeff.johnson@oss.qualcomm.com>
---
 drivers/net/wireless/ath/ath12k/wmi.c | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/drivers/net/wireless/ath/ath12k/wmi.c b/drivers/net/wireless/ath/ath12k/wmi.c
index 672eae237ac6..d466baf5e90a 100644
--- a/drivers/net/wireless/ath/ath12k/wmi.c
+++ b/drivers/net/wireless/ath/ath12k/wmi.c
@@ -4765,14 +4765,16 @@ static int ath12k_wmi_mac_phy_caps_parse(struct ath12k_base *soc,
 	if (svc_rdy_ext->n_mac_phy_caps >= svc_rdy_ext->tot_phy_id)
 		return -ENOBUFS;
 
-	len = min_t(u16, len, sizeof(struct ath12k_wmi_mac_phy_caps_params));
 	if (!svc_rdy_ext->n_mac_phy_caps) {
-		svc_rdy_ext->mac_phy_caps = kzalloc((svc_rdy_ext->tot_phy_id) * len,
-						    GFP_ATOMIC);
+		svc_rdy_ext->mac_phy_caps =
+			kzalloc_objs(*svc_rdy_ext->mac_phy_caps,
+				     svc_rdy_ext->tot_phy_id,
+				     GFP_ATOMIC);
 		if (!svc_rdy_ext->mac_phy_caps)
 			return -ENOMEM;
 	}
 
+	len = min_t(u16, len, sizeof(struct ath12k_wmi_mac_phy_caps_params));
 	memcpy(svc_rdy_ext->mac_phy_caps + svc_rdy_ext->n_mac_phy_caps, ptr, len);
 	svc_rdy_ext->n_mac_phy_caps++;
 	return 0;

-- 
2.43.0

[PATCH ath-next 2/2] wifi: ath11k: fix stride mismatch in mac_phy_caps_parse()

[Jeff Johnson]

Currently, in ath11k_wmi_tlv_mac_phy_caps_parse(), kcalloc() sizes the
mac_phy_caps buffer as tot_phy_id * len, where len is clamped to
min(firmware_len, sizeof(struct wmi_mac_phy_capabilities)). The subsequent
memcpy() destination advances by sizeof(full struct) per slot via C
pointer arithmetic, not by the clamped len. When firmware sends short
TLVs, the second and later slots are written past the end of the
allocation.

The reader in ath11k_pull_mac_phy_cap_svc_ready_ext() also indexes the
buffer with full-struct pointer arithmetic, so the allocation must match
that stride.

Fix by using kzalloc_objs(), which derives the element size from the
pointer type, making allocation size and pointer stride provably
consistent regardless of what len the firmware provides.

Compile tested only.

Fixes: 5b90fc760db5 ("ath11k: fix wmi service ready ext tlv parsing")
Assisted-by: Claude:claude-sonnet-4-6
Signed-off-by: Jeff Johnson <jeff.johnson@oss.qualcomm.com>
---
 drivers/net/wireless/ath/ath11k/wmi.c | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/drivers/net/wireless/ath/ath11k/wmi.c b/drivers/net/wireless/ath/ath11k/wmi.c
index 2d2c6d7a4a3b..f80e9b4a8a39 100644
--- a/drivers/net/wireless/ath/ath11k/wmi.c
+++ b/drivers/net/wireless/ath/ath11k/wmi.c
@@ -4800,14 +4800,16 @@ static int ath11k_wmi_tlv_mac_phy_caps_parse(struct ath11k_base *soc,
 	if (svc_rdy_ext->n_mac_phy_caps >= svc_rdy_ext->tot_phy_id)
 		return -ENOBUFS;
 
-	len = min_t(u16, len, sizeof(struct wmi_mac_phy_capabilities));
 	if (!svc_rdy_ext->n_mac_phy_caps) {
-		svc_rdy_ext->mac_phy_caps = kcalloc(svc_rdy_ext->tot_phy_id,
-						    len, GFP_ATOMIC);
+		svc_rdy_ext->mac_phy_caps =
+			kzalloc_objs(*svc_rdy_ext->mac_phy_caps,
+				     svc_rdy_ext->tot_phy_id,
+				     GFP_ATOMIC);
 		if (!svc_rdy_ext->mac_phy_caps)
 			return -ENOMEM;
 	}
 
+	len = min_t(u16, len, sizeof(struct wmi_mac_phy_capabilities));
 	memcpy(svc_rdy_ext->mac_phy_caps + svc_rdy_ext->n_mac_phy_caps, ptr, len);
 	svc_rdy_ext->n_mac_phy_caps++;
 	return 0;

-- 
2.43.0

Re: [PATCH ath-next 0/2] wifi: ath: fix stride mismatch in mac_phy_caps_parse

[Rameshkumar Sundaram]

On 7/29/2026 6:35 AM, Jeff Johnson wrote:
> Both ath11k and ath12k have the same issue.
> 
> ---
> Jeff Johnson (2):
>        wifi: ath12k: fix stride mismatch in mac_phy_caps_parse()
>        wifi: ath11k: fix stride mismatch in mac_phy_caps_parse()
> 
>   drivers/net/wireless/ath/ath11k/wmi.c | 8 +++++---
>   drivers/net/wireless/ath/ath12k/wmi.c | 8 +++++---
>   2 files changed, 10 insertions(+), 6 deletions(-)
> ---
> base-commit: 189721a4afa1804315e7dcfca9ca0539c7b1d7af
> change-id: 20260720-mac_phy_caps_parse-stride-mismatch-e7292580f072
> 
Reviewed-by: Rameshkumar Sundaram <rameshkumar.sundaram@oss.qualcomm.com>

Re: [PATCH ath-next 0/2] wifi: ath: fix stride mismatch in mac_phy_caps_parse

[Baochen Qiang]

On 7/29/2026 9:05 AM, Jeff Johnson wrote:
> Both ath11k and ath12k have the same issue.
> 
> ---
> Jeff Johnson (2):
>       wifi: ath12k: fix stride mismatch in mac_phy_caps_parse()
>       wifi: ath11k: fix stride mismatch in mac_phy_caps_parse()
> 
>  drivers/net/wireless/ath/ath11k/wmi.c | 8 +++++---
>  drivers/net/wireless/ath/ath12k/wmi.c | 8 +++++---
>  2 files changed, 10 insertions(+), 6 deletions(-)
> ---
> base-commit: 189721a4afa1804315e7dcfca9ca0539c7b1d7af
> change-id: 20260720-mac_phy_caps_parse-stride-mismatch-e7292580f072
> 

Reviewed-by: Baochen Qiang <baochen.qiang@oss.qualcomm.com>

> 

Re: [PATCH ath-next 0/2] wifi: ath: fix stride mismatch in mac_phy_caps_parse

[Jeff Johnson]

On Tue, 28 Jul 2026 18:05:27 -0700, Jeff Johnson wrote:
> Both ath11k and ath12k have the same issue.
> 

Applied, thanks!

[1/2] wifi: ath12k: fix stride mismatch in mac_phy_caps_parse()
      commit: 4c6eb712a91fa079be6f9f1419c96e0ad2227081
[2/2] wifi: ath11k: fix stride mismatch in mac_phy_caps_parse()
      commit: 7a246c72132eb943b5844ba79dad597b47429dba

Best regards,
-- 
Jeff Johnson <jeff.johnson@oss.qualcomm.com>

Re: [PATCH ath-next 0/2] wifi: ath: fix stride mismatch in mac_phy_caps_parse

[Jeff Johnson]

On 7/29/2026 8:26 AM, Jeff Johnson wrote:
> Both ath11k and ath12k have the same issue.
> 
> ---
> Jeff Johnson (2):
>       wifi: ath12k: fix stride mismatch in mac_phy_caps_parse()
>       wifi: ath11k: fix stride mismatch in mac_phy_caps_parse()
> 
>  drivers/net/wireless/ath/ath11k/wmi.c | 8 +++++---
>  drivers/net/wireless/ath/ath12k/wmi.c | 8 +++++---
>  2 files changed, 10 insertions(+), 6 deletions(-)
> ---
> base-commit: 189721a4afa1804315e7dcfca9ca0539c7b1d7af
> change-id: 20260720-mac_phy_caps_parse-stride-mismatch-e7292580f072
> 

<sigh> ignore this repost. invoked the wrong maintainer script...

[PATCH ath-next 0/2] wifi: ath: fix stride mismatch in mac_phy_caps_parse

[Jeff Johnson]

Both ath11k and ath12k have the same issue.

---
Jeff Johnson (2):
      wifi: ath12k: fix stride mismatch in mac_phy_caps_parse()
      wifi: ath11k: fix stride mismatch in mac_phy_caps_parse()

 drivers/net/wireless/ath/ath11k/wmi.c | 8 +++++---
 drivers/net/wireless/ath/ath12k/wmi.c | 8 +++++---
 2 files changed, 10 insertions(+), 6 deletions(-)
---
base-commit: 189721a4afa1804315e7dcfca9ca0539c7b1d7af
change-id: 20260720-mac_phy_caps_parse-stride-mismatch-e7292580f072