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authorEric Dumazet <eric.dumazet@gmail.com>2012-01-31 18:45:40 +0000
committerDavid S. Miller <davem@davemloft.net>2012-02-01 02:11:47 -0500
commita8afca032998850ec63e83d555cdcf0eb5680cd6 (patch)
tree012c06f6b3a2bfa6a908954a671b1e36e2198eb6 /net/ipv6
parent41de8d4cff21a2e81e3d9ff66f5f7c903f9c3ab1 (diff)
tcp: md5: protects md5sig_info with RCU
This patch makes sure we use appropriate memory barriers before publishing tp->md5sig_info, allowing tcp_md5_do_lookup() being used from tcp_v4_send_reset() without holding socket lock (upcoming patch from Shawn Lu) Note we also need to respect rcu grace period before its freeing, since we can free socket without this grace period thanks to SLAB_DESTROY_BY_RCU Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com> Cc: Shawn Lu <shawn.lu@ericsson.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv6')
-rw-r--r--net/ipv6/tcp_ipv6.c2
1 files changed, 0 insertions, 2 deletions
diff --git a/net/ipv6/tcp_ipv6.c b/net/ipv6/tcp_ipv6.c
index bec41f9a6413..c25018106ef2 100644
--- a/net/ipv6/tcp_ipv6.c
+++ b/net/ipv6/tcp_ipv6.c
@@ -571,8 +571,6 @@ static int tcp_v6_parse_md5_keys (struct sock *sk, char __user *optval,
return -EINVAL;
if (!cmd.tcpm_keylen) {
- if (!tcp_sk(sk)->md5sig_info)
- return -ENOENT;
if (ipv6_addr_v4mapped(&sin6->sin6_addr))
return tcp_md5_do_del(sk, (union tcp_md5_addr *)&sin6->sin6_addr.s6_addr32[3],
AF_INET);