From: Bernd Schubert <bernd.schubert@itwm.fraunhofer.de>
Date: Tue, 16 Aug 2011 10:56:54 +0000 (+0000)
Subject: IPoIB: Fix possible NULL dereference in ipoib_start_xmit()
X-Git-Tag: v3.1-rc3~16^2~1
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=22cfb0bf6721bb1f865f67bc21e3c36c272faf36;p=pandora-kernel.git

IPoIB: Fix possible NULL dereference in ipoib_start_xmit()

Fix a bug introduced in 69cce1d14049 ("net: Abstract dst->neighbour
accesses behind helpers.") where we might dereference skb_dst(skb)
even if it is NULL, which causes:

    [  240.944030] BUG: unable to handle kernel NULL pointer dereference at 0000000000000040
    [  240.948007] IP: [<ffffffffa0366ce9>] ipoib_start_xmit+0x39/0x280 [ib_ipoib]
    [...]
    [  240.948007] Call Trace:
    [  240.948007]  <IRQ>
    [  240.948007]  [<ffffffff812cd5e0>] dev_hard_start_xmit+0x2a0/0x590
    [  240.948007]  [<ffffffff8131f680>] ? arp_create+0x70/0x200
    [  240.948007]  [<ffffffff812e8e1f>] sch_direct_xmit+0xef/0x1c0

Addresses: https://bugzilla.kernel.org/show_bug.cgi?id=41212
Signed-off-by: Bernd Schubert <bernd.schubert@itwm.fraunhofer.de>
Signed-off-by: Roland Dreier <roland@purestorage.com>
---

Reading git-diff-tree failed