linux-kernel - Re: [PATCH v4] net: 9p: avoid freeing uninit memory in p9pdu

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Date:   Mon, 11 Dec 2023 13:51:42 +0000
From:   Simon Horman <horms@...nel.org>
To:     Fedor Pchelkin <pchelkin@...ras.ru>
Cc:     Dominique Martinet <asmadeus@...ewreck.org>,
        Christian Schoenebeck <linux_oss@...debyte.com>,
        Eric Van Hensbergen <ericvh@...nel.org>,
        Latchesar Ionkov <lucho@...kov.net>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>, v9fs@...ts.linux.dev,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        Alexey Khoroshilov <khoroshilov@...ras.ru>,
        lvc-project@...uxtesting.org
Subject: Re: [PATCH v4] net: 9p: avoid freeing uninit memory in p9pdu_vreadf

On Wed, Dec 06, 2023 at 11:09:13PM +0300, Fedor Pchelkin wrote:
> If some of p9pdu_readf() calls inside case 'T' in p9pdu_vreadf() fails,
> the error path is not handled properly. *wnames or members of *wnames
> array may be left uninitialized and invalidly freed.
> 
> Initialize *wnames to NULL in beginning of case 'T'. Initialize the first
> *wnames array element to NULL and nullify the failing *wnames element so
> that the error path freeing loop stops on the first NULL element and
> doesn't proceed further.
> 
> Found by Linux Verification Center (linuxtesting.org).
> 
> Fixes: ace51c4dd2f9 ("9p: add new protocol support code")
> Signed-off-by: Fedor Pchelkin <pchelkin@...ras.ru>

Reviewed-by: Simon Horman <horms@...nel.org>