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| author | Li RongQing <roy.qing.li@gmail.com> | 2014-10-17 12:53:23 +0400 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2014-10-18 07:45:26 +0400 |
| commit | 1245dfc8cadb258386fcd27df38215a0eccb1f17 (patch) | |
| tree | 38a3993b3d7e13526c5a9980eb43aaff9ee3c0ad | |
| parent | f88e67149f97d73c704d6fe6f492edde97463025 (diff) | |
| download | linux-1245dfc8cadb258386fcd27df38215a0eccb1f17.tar.xz | |
ipv4: fix a potential use after free in ip_tunnel_core.c
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>
Acked-by: Pravin B Shelar <pshelar@nicira.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
| -rw-r--r-- | net/ipv4/ip_tunnel_core.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/net/ipv4/ip_tunnel_core.c b/net/ipv4/ip_tunnel_core.c index f4c987bb7e94..88c386cf7d85 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 |