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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 /include/linux/tcp.h
parent41de8d4cff21a2e81e3d9ff66f5f7c903f9c3ab1 (diff)
downloadlwn-a8afca032998850ec63e83d555cdcf0eb5680cd6.tar.gz
lwn-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 'include/linux/tcp.h')
-rw-r--r--include/linux/tcp.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/include/linux/tcp.h b/include/linux/tcp.h
index c2025f159641..115389e9b945 100644
--- a/include/linux/tcp.h
+++ b/include/linux/tcp.h
@@ -463,7 +463,7 @@ struct tcp_sock {
const struct tcp_sock_af_ops *af_specific;
/* TCP MD5 Signature Option information */
- struct tcp_md5sig_info *md5sig_info;
+ struct tcp_md5sig_info __rcu *md5sig_info;
#endif
/* When the cookie options are generated and exchanged, then this