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authorEric Dumazet <eric.dumazet@gmail.com>2011-08-26 06:26:15 +0000
committerDavid S. Miller <davem@davemloft.net>2011-08-26 12:49:04 -0400
commite9278a475f845833b569ca47171e64fe48c616e0 (patch)
treedfc4fbbb8bcbcd0fee9c67d17a8c3366f4094959 /net
parent3d015565f316584139946a1c450d44209beefeb6 (diff)
downloadlinux-linaro-stable-e9278a475f845833b569ca47171e64fe48c616e0.tar.gz
netpoll: fix incorrect access to skb data in __netpoll_rx
__netpoll_rx() doesnt properly handle skbs with small header pskb_may_pull() or pskb_trim_rcsum() can change skb->data, we must reload it. Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net')
-rw-r--r--net/core/netpoll.c4
1 files changed, 3 insertions, 1 deletions
diff --git a/net/core/netpoll.c b/net/core/netpoll.c
index adf84dd8c7b5..52622517e0d8 100644
--- a/net/core/netpoll.c
+++ b/net/core/netpoll.c
@@ -558,13 +558,14 @@ int __netpoll_rx(struct sk_buff *skb)
if (skb_shared(skb))
goto out;
- iph = (struct iphdr *)skb->data;
if (!pskb_may_pull(skb, sizeof(struct iphdr)))
goto out;
+ iph = (struct iphdr *)skb->data;
if (iph->ihl < 5 || iph->version != 4)
goto out;
if (!pskb_may_pull(skb, iph->ihl*4))
goto out;
+ iph = (struct iphdr *)skb->data;
if (ip_fast_csum((u8 *)iph, iph->ihl) != 0)
goto out;
@@ -579,6 +580,7 @@ int __netpoll_rx(struct sk_buff *skb)
if (pskb_trim_rcsum(skb, len))
goto out;
+ iph = (struct iphdr *)skb->data;
if (iph->protocol != IPPROTO_UDP)
goto out;