linux-kernel - Re: [PATCH] bus: stm32_firewall: fix off by one in stm32_firewall_get

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Message-ID: <abf316f7-f0c6-4eb3-aee2-fc5413d7c18b@foss.st.com>
Date: Fri, 12 Apr 2024 10:52:49 +0200
From: Gatien CHEVALLIER <gatien.chevallier@...s.st.com>
To: Dan Carpenter <dan.carpenter@...aro.org>
CC: Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Alexandre Torgue
	<alexandre.torgue@...s.st.com>,
        <linux-stm32@...md-mailman.stormreply.com>,
        <linux-arm-kernel@...ts.infradead.org>, <linux-kernel@...r.kernel.org>,
        <kernel-janitors@...r.kernel.org>
Subject: Re: [PATCH] bus: stm32_firewall: fix off by one in
 stm32_firewall_get_firewall()

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@...aro.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@...s.st.com>