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Message-Id: <1395646471-637-1-git-send-email-asuka.com@163.com> Date: Mon, 24 Mar 2014 15:34:31 +0800 From: Wei Zhang <asuka.com@....com> To: xeb@...l.ru, davem@...emloft.net, kuznet@....inr.ac.ru, jmorris@...ei.org, yoshfuji@...ux-ipv6.org, kaber@...sh.net Cc: netdev@...r.kernel.org, linux-kernel@...r.kernel.org, Wei Zhang <asuka.com@....com> Subject: [PATCH] ipv4: gre: Fix null pointer dereference in gre_cisco_err() When use the gre vport, openvswitch register a gre_cisco_protocol but does not supply a err_handler with it. The gre_cisco_err() call the err_handler without existence check, cause the kernel crash. This patch base on v3.14-rc7. But the bug affect all kernel newer than 3.11! Signed-off-by: Wei Zhang <asuka.com@....com> --- net/ipv4/gre_demux.c | 2 +- 1 files changed, 1 insertions(+), 1 deletions(-) diff --git a/net/ipv4/gre_demux.c b/net/ipv4/gre_demux.c index 1863422..56b0d67 100644 --- a/net/ipv4/gre_demux.c +++ b/net/ipv4/gre_demux.c @@ -250,7 +250,7 @@ static void gre_cisco_err(struct sk_buff *skb, u32 info) struct gre_cisco_protocol *proto; proto = rcu_dereference(gre_cisco_proto_list[i]); - if (!proto) + if (!proto || !proto->err_handler) continue; if (proto->err_handler(skb, info, &tpi) == PACKET_RCVD) -- 1.7.1 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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