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| author | Eric Dumazet <eric.dumazet@gmail.com> | 2012-01-31 18:45:40 +0000 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2012-02-01 02:11:47 -0500 |
| commit | a8afca032998850ec63e83d555cdcf0eb5680cd6 (patch) | |
| tree | 012c06f6b3a2bfa6a908954a671b1e36e2198eb6 /net/ipv6 | |
| parent | 41de8d4cff21a2e81e3d9ff66f5f7c903f9c3ab1 (diff) | |
| download | linux-stable-a8afca032998850ec63e83d555cdcf0eb5680cd6.tar.gz linux-stable-a8afca032998850ec63e83d555cdcf0eb5680cd6.tar.bz2 linux-stable-a8afca032998850ec63e83d555cdcf0eb5680cd6.zip | |
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.c | 2 |
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); |