linux-kernel - Re: [PATCH net] net/dccp: fix use-after-free in dccp_invalid

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Message-Id: <20161129.203801.926114791600466509.davem@davemloft.net>
Date:   Tue, 29 Nov 2016 20:38:01 -0500 (EST)
From:   David Miller <davem@...emloft.net>
To:     eric.dumazet@...il.com
Cc:     andreyknvl@...gle.com, gerrit@....abdn.ac.uk, dccp@...r.kernel.org,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        dvyukov@...gle.com, kcc@...gle.com, edumazet@...gle.com,
        syzkaller@...glegroups.com
Subject: Re: [PATCH net] net/dccp: fix use-after-free in dccp_invalid_packet

From: Eric Dumazet <eric.dumazet@...il.com>
Date: Mon, 28 Nov 2016 06:26:49 -0800

> From: Eric Dumazet <edumazet@...gle.com>
> 
> pskb_may_pull() can reallocate skb->head, we need to reload dh pointer
> in dccp_invalid_packet() or risk use after free.
> 
> Bug found by Andrey Konovalov using syzkaller.
> 
> Signed-off-by: Eric Dumazet <edumazet@...gle.com>
> Reported-by: Andrey Konovalov <andreyknvl@...gle.com>

Applied and queued up for -stable, thanks Eric.