linux-kernel - Re: mwifiex: fix double free

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Message-Id: <20201008104643.DF562C433A1@smtp.codeaurora.org>
Date:   Thu,  8 Oct 2020 10:46:43 +0000 (UTC)
From:   Kalle Valo <kvalo@...eaurora.org>
To:     trix@...hat.com
Cc:     amitkarwar@...il.com, ganapathi.bhat@....com,
        huxinming820@...il.com, davem@...emloft.net, kuba@...nel.org,
        natechancellor@...il.com, ndesaulniers@...gle.com,
        linville@...driver.com, nishants@...vell.com, rramesh@...vell.com,
        bzhao@...vell.com, frankh@...vell.com,
        linux-wireless@...r.kernel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, clang-built-linux@...glegroups.com,
        Tom Rix <trix@...hat.com>
Subject: Re: mwifiex: fix double free

trix@...hat.com wrote:

> From: Tom Rix <trix@...hat.com>
> 
> clang static analysis reports this problem:
> 
> sdio.c:2403:3: warning: Attempt to free released memory
>         kfree(card->mpa_rx.buf);
>         ^~~~~~~~~~~~~~~~~~~~~~~
> 
> When mwifiex_init_sdio() fails in its first call to
> mwifiex_alloc_sdio_mpa_buffer, it falls back to calling it
> again.  If the second alloc of mpa_tx.buf fails, the error
> handler will try to free the old, previously freed mpa_rx.buf.
> Reviewing the code, it looks like a second double free would
> happen with mwifiex_cleanup_sdio().
> 
> So set both pointers to NULL when they are freed.
> 
> Fixes: 5e6e3a92b9a4 ("wireless: mwifiex: initial commit for Marvell mwifiex driver")
> Signed-off-by: Tom Rix <trix@...hat.com>
> Reviewed-by: Brian Norris <briannorris@...omium.org>

Patch applied to wireless-drivers-next.git, thanks.

53708f4fd9cf mwifiex: fix double free

-- 
https://patchwork.kernel.org/patch/11815655/

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