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authorEric Dumazet <edumazet@google.com>2013-05-18 08:36:03 +0000
committerDavid S. Miller <davem@davemloft.net>2013-05-20 00:18:52 -0700
commit96f5a846bdd60986992228bc7dae94d4d8eaacc0 (patch)
tree6f999dce0e017d8e14d4257af04fdd9226b7fd42 /net
parentb423e9ae49d78ea3f53b131c8d5a6087aed16fd6 (diff)
downloadlinux-96f5a846bdd60986992228bc7dae94d4d8eaacc0.tar.gz
ip_gre: fix a possible crash in ipgre_err()
Another fix needed in ipgre_err(), as parse_gre_header() might change skb->head. Bug added in commit c54419321455 (GRE: Refactor GRE tunneling code.) Signed-off-by: Eric Dumazet <edumazet@google.com> Cc: Pravin B Shelar <pshelar@nicira.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net')
-rw-r--r--net/ipv4/ip_gre.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/net/ipv4/ip_gre.c b/net/ipv4/ip_gre.c
index c625e4dad4b..2a83591492d 100644
--- a/net/ipv4/ip_gre.c
+++ b/net/ipv4/ip_gre.c
@@ -235,7 +235,7 @@ static void ipgre_err(struct sk_buff *skb, u32 info)
*/
struct net *net = dev_net(skb->dev);
struct ip_tunnel_net *itn;
- const struct iphdr *iph = (const struct iphdr *)skb->data;
+ const struct iphdr *iph;
const int type = icmp_hdr(skb)->type;
const int code = icmp_hdr(skb)->code;
struct ip_tunnel *t;
@@ -281,6 +281,7 @@ static void ipgre_err(struct sk_buff *skb, u32 info)
else
itn = net_generic(net, ipgre_net_id);
+ iph = (const struct iphdr *)skb->data;
t = ip_tunnel_lookup(itn, skb->dev->ifindex, tpi.flags,
iph->daddr, iph->saddr, tpi.key);