[PATCH] bus: stm32_firewall: fix off by one in stm32_firewall_get_firewall()

[PATCH] bus: stm32_firewall: fix off by one in stm32_firewall_get_firewall()

[Dan Carpenter]

The "nb_firewall" variable is the number of elements in the firewall[]
array, which is allocated in stm32_firewall_populate_bus().  So change
this > comparison to >= to prevent an out of bound access.

Fixes: 5c9668cfc6d7 ("firewall: introduce stm32_firewall framework")
Signed-off-by: Dan Carpenter <dan.carpenter@linaro.org>
---
 drivers/bus/stm32_firewall.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/bus/stm32_firewall.c b/drivers/bus/stm32_firewall.c
index decb79449047..2fc9761dadec 100644
--- a/drivers/bus/stm32_firewall.c
+++ b/drivers/bus/stm32_firewall.c
@@ -53,7 +53,7 @@ int stm32_firewall_get_firewall(struct device_node *np, struct stm32_firewall *f
 			return err;
 		}
 
-		if (j > nb_firewall) {
+		if (j >= nb_firewall) {
 			pr_err("Too many firewall controllers");
 			of_node_put(provider);
 			return -EINVAL;
-- 
2.43.0


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Re: [PATCH] bus: stm32_firewall: fix off by one in stm32_firewall_get_firewall()

[Gatien CHEVALLIER]

Hi Dan,

On 4/12/24 10:25, Dan Carpenter wrote:
> The "nb_firewall" variable is the number of elements in the firewall[]
> array, which is allocated in stm32_firewall_populate_bus().  So change
> this > comparison to >= to prevent an out of bound access.
> 
> Fixes: 5c9668cfc6d7 ("firewall: introduce stm32_firewall framework")
> Signed-off-by: Dan Carpenter <dan.carpenter@linaro.org>
> ---
>   drivers/bus/stm32_firewall.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/bus/stm32_firewall.c b/drivers/bus/stm32_firewall.c
> index decb79449047..2fc9761dadec 100644
> --- a/drivers/bus/stm32_firewall.c
> +++ b/drivers/bus/stm32_firewall.c
> @@ -53,7 +53,7 @@ int stm32_firewall_get_firewall(struct device_node *np, struct stm32_firewall *f
>   			return err;
>   		}
>   
> -		if (j > nb_firewall) {
> +		if (j >= nb_firewall) {
>   			pr_err("Too many firewall controllers");
>   			of_node_put(provider);
>   			return -EINVAL;
Thank you.

Reviewed-by: Gatien Chevallier <gatien.chevallier@foss.st.com>

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Re: [PATCH] bus: stm32_firewall: fix off by one in stm32_firewall_get_firewall()

[Alexandre TORGUE]

Hi Dan

On 4/12/24 10:25, Dan Carpenter wrote:
> The "nb_firewall" variable is the number of elements in the firewall[]
> array, which is allocated in stm32_firewall_populate_bus().  So change
> this > comparison to >= to prevent an out of bound access.
> 
> Fixes: 5c9668cfc6d7 ("firewall: introduce stm32_firewall framework")
> Signed-off-by: Dan Carpenter <dan.carpenter@linaro.org>
> ---
>   drivers/bus/stm32_firewall.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/bus/stm32_firewall.c b/drivers/bus/stm32_firewall.c
> index decb79449047..2fc9761dadec 100644
> --- a/drivers/bus/stm32_firewall.c
> +++ b/drivers/bus/stm32_firewall.c
> @@ -53,7 +53,7 @@ int stm32_firewall_get_firewall(struct device_node *np, struct stm32_firewall *f
>   			return err;
>   		}
>   
> -		if (j > nb_firewall) {
> +		if (j >= nb_firewall) {
>   			pr_err("Too many firewall controllers");
>   			of_node_put(provider);
>   			return -EINVAL;

Applied on stm32-next.

Regards
Alex

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