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authorEric Dumazet <eric.dumazet@gmail.com>2010-05-29 00:20:48 -0700
committerDavid S. Miller <davem@davemloft.net>2010-05-29 00:20:48 -0700
commit2903037400a26e7c0cc93ab75a7d62abfacdf485 (patch)
treec29d8b3199d8fa52856e5edcd374411f962d7c11 /net/ipv6
parent7dfde179c38056b91d51e60f3d50902387f27c84 (diff)
downloadlinux-2.6.34-ux500-2903037400a26e7c0cc93ab75a7d62abfacdf485.tar.gz
net: fix sk_forward_alloc corruptions
As David found out, sock_queue_err_skb() should be called with socket lock hold, or we risk sk_forward_alloc corruption, since we use non atomic operations to update this field. This patch adds bh_lock_sock()/bh_unlock_sock() pair to three spots. (BH already disabled) 1) skb_tstamp_tx() 2) Before calling ip_icmp_error(), in __udp4_lib_err() 3) Before calling ipv6_icmp_error(), in __udp6_lib_err() Reported-by: Anton Blanchard <anton@samba.org> Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv6')
-rw-r--r--net/ipv6/udp.c6
1 files changed, 4 insertions, 2 deletions
diff --git a/net/ipv6/udp.c b/net/ipv6/udp.c
index 87be58673b5..3048f906c04 100644
--- a/net/ipv6/udp.c
+++ b/net/ipv6/udp.c
@@ -466,9 +466,11 @@ void __udp6_lib_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
if (sk->sk_state != TCP_ESTABLISHED && !np->recverr)
goto out;
- if (np->recverr)
+ if (np->recverr) {
+ bh_lock_sock(sk);
ipv6_icmp_error(sk, skb, err, uh->dest, ntohl(info), (u8 *)(uh+1));
-
+ bh_unlock_sock(sk);
+ }
sk->sk_err = err;
sk->sk_error_report(sk);
out: