diff options
| author | Eric Dumazet <eric.dumazet@gmail.com> | 2010-05-29 00:20:48 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2012-02-13 11:28:51 -0800 |
| commit | 956a79d503998a763dd71847f2f9eb19349c2aba (patch) | |
| tree | 612b5bae398638984dc2a101a53b079077a93fea /net/ipv6/udp.c | |
| parent | aa4ba12335659a1afd79d430f038114ce1434690 (diff) | |
net: fix sk_forward_alloc corruptions
commit 2903037400a26e7c0cc93ab75a7d62abfacdf485 upstream.
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>
Cc: 单卫 <shanwei88@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'net/ipv6/udp.c')
| -rw-r--r-- | net/ipv6/udp.c | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/net/ipv6/udp.c b/net/ipv6/udp.c index 9cc6289acae..12d8791daf9 100644 --- a/net/ipv6/udp.c +++ b/net/ipv6/udp.c @@ -337,9 +337,11 @@ 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: |