netdev - Re: [PATCH] ping: Fix race in free in receive path

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Message-ID: <1422054463.29618.12.camel@edumazet-glaptop2.roam.corp.google.com>
Date:	Fri, 23 Jan 2015 15:07:43 -0800
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	subashab@...eaurora.org
Cc:	netdev@...r.kernel.org, edumazet@...gle.com
Subject: Re: [PATCH] ping: Fix race in free in receive path

On Fri, 2015-01-23 at 22:26 +0000, subashab@...eaurora.org wrote:
> An exception is seen in ICMP ping receive path where the skb
> destructor sock_rfree() tries to access a freed socket. This happens
> because ping_rcv() releases socket reference with sock_put() and this
> internally frees up the socket. Later icmp_rcv() will try to free the
> skb and as part of this, skb destructor is called and which leads
> to a kernel panic as the socket is freed already in ping_rcv().
...
> Signed-off-by: Subash Abhinov Kasiviswanathan <subashab@...eaurora.org>
> Cc: Eric Dumazet <edumazet@...gle.com>
> ---

Thanks !

Signed-off-by: Eric Dumazet <edumazet@...gle.com>


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