From: Steffen Klassert <steffen.klassert@secunet.com>
Date: Wed, 30 Oct 2013 10:16:28 +0000 (+0100)
Subject: xfrm: Fix null pointer dereference when decoding sessions
X-Git-Tag: omap-for-v3.13/fixes-for-merge-window-take2~67^2~4^2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=84502b5ef9849a9694673b15c31bd3ac693010ae;p=pandora-kernel.git

xfrm: Fix null pointer dereference when decoding sessions

On some codepaths the skb does not have a dst entry
when xfrm_decode_session() is called. So check for
a valid skb_dst() before dereferencing the device
interface index. We use 0 as the device index if
there is no valid skb_dst(), or at reverse decoding
we use skb_iif as device interface index.

Bug was introduced with git commit bafd4bd4dc
("xfrm: Decode sessions with output interface.").

Reported-by: Meelis Roos <mroos@linux.ee>
Tested-by: Meelis Roos <mroos@linux.ee>
Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
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