From: roy.qing.li@gmail.com
To: netdev@vger.kernel.org
Cc: pshelar@nicira.com
Subject: [PATCH] ipv4: fix a potential use after free
Date: Fri, 17 Oct 2014 16:53:23 +0800 [thread overview]
Message-ID: <1413536003-15646-1-git-send-email-roy.qing.li@gmail.com> (raw)
From: Li RongQing <roy.qing.li@gmail.com>
pskb_may_pull() maybe change skb->data and make eth pointer oboslete,
so set eth after pskb_may_pull()
Fixes:3d7b46cd("ip_tunnel: push generic protocol handling to ip_tunnel module")
Cc: Pravin B Shelar <pshelar@nicira.com>
Signed-off-by: Li RongQing <roy.qing.li@gmail.com>
---
net/ipv4/ip_tunnel_core.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/net/ipv4/ip_tunnel_core.c b/net/ipv4/ip_tunnel_core.c
index f4c987b..88c386c 100644
--- a/net/ipv4/ip_tunnel_core.c
+++ b/net/ipv4/ip_tunnel_core.c
@@ -91,11 +91,12 @@ int iptunnel_pull_header(struct sk_buff *skb, int hdr_len, __be16 inner_proto)
skb_pull_rcsum(skb, hdr_len);
if (inner_proto == htons(ETH_P_TEB)) {
- struct ethhdr *eh = (struct ethhdr *)skb->data;
+ struct ethhdr *eh;
if (unlikely(!pskb_may_pull(skb, ETH_HLEN)))
return -ENOMEM;
+ eh = (struct ethhdr *)skb->data;
if (likely(ntohs(eh->h_proto) >= ETH_P_802_3_MIN))
skb->protocol = eh->h_proto;
else
--
1.7.10.4
next reply other threads:[~2014-10-17 8:53 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-10-17 8:53 roy.qing.li [this message]
2014-10-17 17:07 ` [PATCH] ipv4: fix a potential use after free Pravin Shelar
2014-10-18 3:46 ` David Miller
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