From: Li RongQing <roy.qing.li@gmail.com>
Date: Sat, 18 Oct 2014 09:26:04 +0000 (+0800)
Subject: ipv4: fix a potential use after free in gre_offload.c
X-Git-Tag: omap-for-v3.19/prcm-cleanup~36^2~3
X-Git-Url: https://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=b4e3cef703fb21b26db053a770900f2bd910638b;p=pandora-kernel.git

ipv4: fix a potential use after free in gre_offload.c

pskb_may_pull() may change skb->data and make greh pointer oboslete;
so need to reassign greh;
but since first calling pskb_may_pull already ensured that skb->data
has enough space for greh, so move the reference of greh before second
calling pskb_may_pull(), to avoid reassign greh.

Fixes: 7a7ffbabf9("ipv4: fix tunneled VM traffic over hw VXLAN/GRE GSO NIC")
Cc: Wei-Chun Chao <weichunc@plumgrid.com>
Signed-off-by: Li RongQing <roy.qing.li@gmail.com>
Acked-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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