netdev - Re: [PATCH] ath: dfs_pattern_detector: Fix possible null-pointer dereference in channel_detector

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Date:   Mon, 11 Oct 2021 06:26:19 +0000 (UTC)
From:   Kalle Valo <kvalo@...eaurora.org>
To:     Tuo Li <islituo@...il.com>
Cc:     davem@...emloft.net, kuba@...nel.org,
        linux-wireless@...r.kernel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, baijiaju1990@...il.com,
        Tuo Li <islituo@...il.com>, TOTE Robot <oslab@...nghua.edu.cn>
Subject: Re: [PATCH] ath: dfs_pattern_detector: Fix possible null-pointer
 dereference in channel_detector_create()

Tuo Li <islituo@...il.com> wrote:

> kzalloc() is used to allocate memory for cd->detectors, and if it fails,
> channel_detector_exit() behind the label fail will be called:
>   channel_detector_exit(dpd, cd);
> 
> In channel_detector_exit(), cd->detectors is dereferenced through:
>   struct pri_detector *de = cd->detectors[i];
> 
> To fix this possible null-pointer dereference, check cd->detectors before
> the for loop to dereference cd->detectors.
> 
> Reported-by: TOTE Robot <oslab@...nghua.edu.cn>
> Signed-off-by: Tuo Li <islituo@...il.com>
> Signed-off-by: Kalle Valo <kvalo@...eaurora.org>

Patch applied to ath-next branch of ath.git, thanks.

4b6012a7830b ath: dfs_pattern_detector: Fix possible null-pointer dereference in channel_detector_create()

-- 
https://patchwork.kernel.org/project/linux-wireless/patch/20210805153854.154066-1-islituo@gmail.com/

https://wireless.wiki.kernel.org/en/developers/documentation/submittingpatches