ipv6: fix possible use-after-free in ip6_xmit()
authorEric Dumazet <edumazet@google.com>
Fri, 14 Sep 2018 19:02:31 +0000 (12:02 -0700)
committerDavid S. Miller <davem@davemloft.net>
Mon, 17 Sep 2018 14:56:02 +0000 (07:56 -0700)
In the unlikely case ip6_xmit() has to call skb_realloc_headroom(),
we need to call skb_set_owner_w() before consuming original skb,
otherwise we risk a use-after-free.

Bring IPv6 in line with what we do in IPv4 to fix this.

Fixes: 1da177e4c3f41 ("Linux-2.6.12-rc2")
Signed-off-by: Eric Dumazet <edumazet@google.com>
Reported-by: syzbot <syzkaller@googlegroups.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
net/ipv6/ip6_output.c

index 16f200f..f9f8f55 100644 (file)
@@ -219,12 +219,10 @@ int ip6_xmit(const struct sock *sk, struct sk_buff *skb, struct flowi6 *fl6,
                                kfree_skb(skb);
                                return -ENOBUFS;
                        }
+                       if (skb->sk)
+                               skb_set_owner_w(skb2, skb->sk);
                        consume_skb(skb);
                        skb = skb2;
-                       /* skb_set_owner_w() changes sk->sk_wmem_alloc atomically,
-                        * it is safe to call in our context (socket lock not held)
-                        */
-                       skb_set_owner_w(skb, (struct sock *)sk);
                }
                if (opt->opt_flen)
                        ipv6_push_frag_opts(skb, opt, &proto);