Commits
Eric Dumazet committed 4ea2739ea89
pptp: pptp_rcv_core() misses pskb_may_pull() call e1000e uses paged frags, so any layer incorrectly pulling bytes from skb can trigger a BUG in skb_pull() [951.142737] [<ffffffff813d2f36>] skb_pull+0x15/0x17 [951.142737] [<ffffffffa0286824>] pptp_rcv_core+0x126/0x19a [pptp] [951.152725] [<ffffffff813d17c4>] sk_receive_skb+0x69/0x105 [951.163558] [<ffffffffa0286993>] pptp_rcv+0xc8/0xdc [pptp] [951.165092] [<ffffffffa02800a3>] gre_rcv+0x62/0x75 [gre] [951.165092] [<ffffffff81410784>] ip_local_deliver_finish+0x150/0x1c1 [951.177599] [<ffffffff81410634>] ? ip_local_deliver_finish+0x0/0x1c1 [951.177599] [<ffffffff81410846>] NF_HOOK.clone.7+0x51/0x58 [951.177599] [<ffffffff81410996>] ip_local_deliver+0x51/0x55 [951.177599] [<ffffffff814105b9>] ip_rcv_finish+0x31a/0x33e [951.177599] [<ffffffff8141029f>] ? ip_rcv_finish+0x0/0x33e [951.204898] [<ffffffff81410846>] NF_HOOK.clone.7+0x51/0x58 [951.214651] [<ffffffff81410bb5>] ip_rcv+0x21b/0x246 pptp_rcv_core() is a nice example of a function assuming everything it needs is available in skb head. Reported-by: Bradley Peterson <despite@gmail.com> Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>