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 | |
| 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>
| -rw-r--r-- | net/core/skbuff.c | 4 | ||||
| -rw-r--r-- | net/ipv4/udp.c | 2 | ||||
| -rw-r--r-- | net/ipv6/udp.c | 6 |
3 files changed, 10 insertions, 2 deletions
diff --git a/net/core/skbuff.c b/net/core/skbuff.c index a807f8c53fb..50a85e31bf6 100644 --- a/net/core/skbuff.c +++ b/net/core/skbuff.c @@ -3008,7 +3008,11 @@ void skb_tstamp_tx(struct sk_buff *orig_skb, memset(serr, 0, sizeof(*serr)); serr->ee.ee_errno = ENOMSG; serr->ee.ee_origin = SO_EE_ORIGIN_TIMESTAMPING; + + bh_lock_sock(sk); err = sock_queue_err_skb(sk, skb); + bh_unlock_sock(sk); + if (err) kfree_skb(skb); } diff --git a/net/ipv4/udp.c b/net/ipv4/udp.c index 0ac88332d56..4a7fd783f98 100644 --- a/net/ipv4/udp.c +++ b/net/ipv4/udp.c @@ -441,7 +441,9 @@ void __udp4_lib_err(struct sk_buff *skb, u32 info, struct udp_table *udptable) if (!harderr || sk->sk_state != TCP_ESTABLISHED) goto out; } else { + bh_lock_sock(sk); ip_icmp_error(sk, skb, err, uh->dest, info, (u8 *)(uh+1)); + bh_unlock_sock(sk); } sk->sk_err = err; sk->sk_error_report(sk); 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: |