* [PATCH RESEND] EDAC/altera: Fix possible null pointer dereference
@ 2024-08-02 3:38 Ma Ke
2024-08-02 6:01 ` Naik, Avadhut
0 siblings, 1 reply; 4+ messages in thread
From: Ma Ke @ 2024-08-02 3:38 UTC (permalink / raw)
To: dinguyen, bp, tony.luck, james.morse, mchehab, rric, niravkumar.l.rabara
Cc: linux-edac, linux-kernel, Ma Ke, stable
In altr_s10_sdram_check_ecc_deps(), of_get_address() may return NULL which
is later dereferenced. Fix this bug by adding NULL check.
Cc: stable@vger.kernel.org
Fixes: e1bca853dddc ("EDAC/altera: Add SDRAM ECC check for U-Boot")
Signed-off-by: Ma Ke <make24@iscas.ac.cn>
---
drivers/edac/altera_edac.c | 11 +++++++++--
1 file changed, 9 insertions(+), 2 deletions(-)
diff --git a/drivers/edac/altera_edac.c b/drivers/edac/altera_edac.c
index fe89f5c4837f..d6bf0eebeb41 100644
--- a/drivers/edac/altera_edac.c
+++ b/drivers/edac/altera_edac.c
@@ -1086,6 +1086,7 @@ static int altr_s10_sdram_check_ecc_deps(struct altr_edac_device_dev *device)
struct arm_smccc_res result;
struct device_node *np;
phys_addr_t sdram_addr;
+ const __be32 *sdram_addrp;
u32 read_reg;
int ret;
@@ -1093,8 +1094,14 @@ static int altr_s10_sdram_check_ecc_deps(struct altr_edac_device_dev *device)
if (!np)
goto sdram_err;
- sdram_addr = of_translate_address(np, of_get_address(np, 0,
- NULL, NULL));
+ sdram_addrp = of_get_address(np, 0, NULL, NULL);
+ if (!sdram_addrp)
+ return -EINVAL;
+
+ sdram_addr = of_translate_address(np, sdram_addrp);
+ if (!sdram_addr)
+ return -EINVAL;
+
of_node_put(np);
sdram_ecc_addr = (unsigned long)sdram_addr + prv->ecc_en_ofst;
arm_smccc_smc(INTEL_SIP_SMC_REG_READ, sdram_ecc_addr,
--
2.25.1
^ permalink raw reply [flat|nested] 4+ messages in thread* Re: [PATCH RESEND] EDAC/altera: Fix possible null pointer dereference
2024-08-02 3:38 [PATCH RESEND] EDAC/altera: Fix possible null pointer dereference Ma Ke
@ 2024-08-02 6:01 ` Naik, Avadhut
0 siblings, 0 replies; 4+ messages in thread
From: Naik, Avadhut @ 2024-08-02 6:01 UTC (permalink / raw)
To: Ma Ke, dinguyen, bp, tony.luck, james.morse, mchehab, rric,
niravkumar.l.rabara
Cc: linux-edac, linux-kernel, stable
On 8/1/2024 22:38, Ma Ke wrote:
> In altr_s10_sdram_check_ecc_deps(), of_get_address() may return NULL which
> is later dereferenced. Fix this bug by adding NULL check.
>
Only of_get_address() has been mentioned here but the patch also tries to
fix a possible NULL pointer dereference arising from of_translate_address().
Also, a some context on how this was discovered might be helpful.
> Cc: stable@vger.kernel.org
> Fixes: e1bca853dddc ("EDAC/altera: Add SDRAM ECC check for U-Boot")
> Signed-off-by: Ma Ke <make24@iscas.ac.cn>
> ---
> drivers/edac/altera_edac.c | 11 +++++++++--
> 1 file changed, 9 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/edac/altera_edac.c b/drivers/edac/altera_edac.c
> index fe89f5c4837f..d6bf0eebeb41 100644
> --- a/drivers/edac/altera_edac.c
> +++ b/drivers/edac/altera_edac.c
> @@ -1086,6 +1086,7 @@ static int altr_s10_sdram_check_ecc_deps(struct altr_edac_device_dev *device)
> struct arm_smccc_res result;
> struct device_node *np;
> phys_addr_t sdram_addr;
> + const __be32 *sdram_addrp;
> u32 read_reg;
> int ret;
>
> @@ -1093,8 +1094,14 @@ static int altr_s10_sdram_check_ecc_deps(struct altr_edac_device_dev *device)
> if (!np)
> goto sdram_err;
>
> - sdram_addr = of_translate_address(np, of_get_address(np, 0,
> - NULL, NULL));
> + sdram_addrp = of_get_address(np, 0, NULL, NULL);
> + if (!sdram_addrp)
> + return -EINVAL;
> +
> + sdram_addr = of_translate_address(np, sdram_addrp);
> + if (!sdram_addr)
> + return -EINVAL;
> +
Will sdram_addr here ever be NULL?
IIUC, of_translate_address() will return OF_BAD_ADDR in case the translation fails.
Perhaps, a more prudent check here, if required, would be
if (sdram_addr == OF_BAD_ADDR)
--
Thanks,
Avadhut Naik
^ permalink raw reply [flat|nested] 4+ messages in thread
* [PATCH RESEND] EDAC/altera: Fix possible null pointer dereference
@ 2024-07-24 7:05 Ma Ke
0 siblings, 0 replies; 4+ messages in thread
From: Ma Ke @ 2024-07-24 7:05 UTC (permalink / raw)
To: dinguyen, bp, tony.luck, james.morse, mchehab, rric, niravkumar.l.rabara
Cc: linux-edac, linux-kernel, Ma Ke, stable
In altr_s10_sdram_check_ecc_deps(), of_get_address() may return NULL which
is later dereferenced. Fix this bug by adding NULL check.
Cc: stable@vger.kernel.org
Fixes: e1bca853dddc ("EDAC/altera: Add SDRAM ECC check for U-Boot")
Signed-off-by: Ma Ke <make24@iscas.ac.cn>
---
drivers/edac/altera_edac.c | 11 +++++++++--
1 file changed, 9 insertions(+), 2 deletions(-)
diff --git a/drivers/edac/altera_edac.c b/drivers/edac/altera_edac.c
index fe89f5c4837f..d6bf0eebeb41 100644
--- a/drivers/edac/altera_edac.c
+++ b/drivers/edac/altera_edac.c
@@ -1086,6 +1086,7 @@ static int altr_s10_sdram_check_ecc_deps(struct altr_edac_device_dev *device)
struct arm_smccc_res result;
struct device_node *np;
phys_addr_t sdram_addr;
+ const __be32 *sdram_addrp;
u32 read_reg;
int ret;
@@ -1093,8 +1094,14 @@ static int altr_s10_sdram_check_ecc_deps(struct altr_edac_device_dev *device)
if (!np)
goto sdram_err;
- sdram_addr = of_translate_address(np, of_get_address(np, 0,
- NULL, NULL));
+ sdram_addrp = of_get_address(np, 0, NULL, NULL);
+ if (!sdram_addrp)
+ return -EINVAL;
+
+ sdram_addr = of_translate_address(np, sdram_addrp);
+ if (!sdram_addr)
+ return -EINVAL;
+
of_node_put(np);
sdram_ecc_addr = (unsigned long)sdram_addr + prv->ecc_en_ofst;
arm_smccc_smc(INTEL_SIP_SMC_REG_READ, sdram_ecc_addr,
--
2.25.1
^ permalink raw reply [flat|nested] 4+ messages in thread* [PATCH RESEND] EDAC/altera: Fix possible null pointer dereference
@ 2024-07-18 13:29 Ma Ke
0 siblings, 0 replies; 4+ messages in thread
From: Ma Ke @ 2024-07-18 13:29 UTC (permalink / raw)
To: dinguyen, bp, tony.luck, james.morse, mchehab, rric, niravkumar.l.rabara
Cc: linux-edac, linux-kernel, Ma Ke, stable
In altr_s10_sdram_check_ecc_deps(), of_get_address() may return NULL which
is later dereferenced. Fix this bug by adding NULL check.
Cc: stable@vger.kernel.org
Fixes: e1bca853dddc ("EDAC/altera: Add SDRAM ECC check for U-Boot")
Signed-off-by: Ma Ke <make24@iscas.ac.cn>
---
drivers/edac/altera_edac.c | 11 +++++++++--
1 file changed, 9 insertions(+), 2 deletions(-)
diff --git a/drivers/edac/altera_edac.c b/drivers/edac/altera_edac.c
index fe89f5c4837f..d6bf0eebeb41 100644
--- a/drivers/edac/altera_edac.c
+++ b/drivers/edac/altera_edac.c
@@ -1086,6 +1086,7 @@ static int altr_s10_sdram_check_ecc_deps(struct altr_edac_device_dev *device)
struct arm_smccc_res result;
struct device_node *np;
phys_addr_t sdram_addr;
+ const __be32 *sdram_addrp;
u32 read_reg;
int ret;
@@ -1093,8 +1094,14 @@ static int altr_s10_sdram_check_ecc_deps(struct altr_edac_device_dev *device)
if (!np)
goto sdram_err;
- sdram_addr = of_translate_address(np, of_get_address(np, 0,
- NULL, NULL));
+ sdram_addrp = of_get_address(np, 0, NULL, NULL);
+ if (!sdram_addrp)
+ return -EINVAL;
+
+ sdram_addr = of_translate_address(np, sdram_addrp);
+ if (!sdram_addr)
+ return -EINVAL;
+
of_node_put(np);
sdram_ecc_addr = (unsigned long)sdram_addr + prv->ecc_en_ofst;
arm_smccc_smc(INTEL_SIP_SMC_REG_READ, sdram_ecc_addr,
--
2.25.1
^ permalink raw reply [flat|nested] 4+ messages in thread
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