netdev - Re: BUG in skb_pull with e1000e, PPTP, and L2TP

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Message-Id: <20111019.033154.371626230759904957.davem@davemloft.net>
Date:	Wed, 19 Oct 2011 03:31:54 -0400 (EDT)
From:	David Miller <davem@...emloft.net>
To:	eric.dumazet@...il.com
Cc:	despite@...il.com, netdev@...r.kernel.org,
	jeffrey.t.kirsher@...el.com, jesse.brandeburg@...el.com,
	bruce.w.allan@...el.com, carolyn.wyborny@...el.com,
	donald.c.skidmore@...el.com, gregory.v.rose@...el.com,
	peter.p.waskiewicz.jr@...el.com, alexander.h.duyck@...el.com,
	john.ronciak@...el.com, e1000-devel@...ts.sourceforge.net
Subject: Re: BUG in skb_pull with e1000e, PPTP, and L2TP

From: Eric Dumazet <eric.dumazet@...il.com>
Date: Tue, 18 Oct 2011 05:59:53 +0200

> [PATCH v2] pptp: pptp_rcv_core() misses pskb_may_pull() call
> 
> e1000e uses paged frags, so any layer incorrectly pulling bytes from skb
> can trigger a BUG in skb_pull()
> 
> [951.142737]  [<ffffffff813d2f36>] skb_pull+0x15/0x17
> [951.142737]  [<ffffffffa0286824>] pptp_rcv_core+0x126/0x19a [pptp]
> [951.152725]  [<ffffffff813d17c4>] sk_receive_skb+0x69/0x105
> [951.163558]  [<ffffffffa0286993>] pptp_rcv+0xc8/0xdc [pptp]
> [951.165092]  [<ffffffffa02800a3>] gre_rcv+0x62/0x75 [gre]
> [951.165092]  [<ffffffff81410784>] ip_local_deliver_finish+0x150/0x1c1
> [951.177599]  [<ffffffff81410634>] ? ip_local_deliver_finish+0x0/0x1c1
> [951.177599]  [<ffffffff81410846>] NF_HOOK.clone.7+0x51/0x58
> [951.177599]  [<ffffffff81410996>] ip_local_deliver+0x51/0x55
> [951.177599]  [<ffffffff814105b9>] ip_rcv_finish+0x31a/0x33e
> [951.177599]  [<ffffffff8141029f>] ? ip_rcv_finish+0x0/0x33e
> [951.204898]  [<ffffffff81410846>] NF_HOOK.clone.7+0x51/0x58
> [951.214651]  [<ffffffff81410bb5>] ip_rcv+0x21b/0x246
> 
> pptp_rcv_core() is a nice example of a function assuming everything it
> needs is available in skb head.
> 
> Reported-by: Bradley Peterson <despite@...il.com>
> Signed-off-by: Eric Dumazet <eric.dumazet@...il.com>

I assume by the driver paths in the patch that you think this
is 'net-next' material and not suitable for plain 'net', right?
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