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authorEric Dumazet <eric.dumazet@gmail.com>2009-12-04 03:47:42 +0000
committerDavid S. Miller <davem@davemloft.net>2009-12-08 20:17:51 -0800
commit3cdaedae635b17ce23c738ce7d364b442310cdec (patch)
treeaf07cdf6c31cca8d1a094bd104efa65e1e95e270 /include
parent9327f7053e3993c125944fdb137a0618319ef2a0 (diff)
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tcp: Fix a connect() race with timewait sockets
When we find a timewait connection in __inet_hash_connect() and reuse it for a new connection request, we have a race window, releasing bind list lock and reacquiring it in __inet_twsk_kill() to remove timewait socket from list. Another thread might find the timewait socket we already chose, leading to list corruption and crashes. Fix is to remove timewait socket from bind list before releasing the bind lock. Note: This problem happens if sysctl_tcp_tw_reuse is set. Reported-by: kapil dakhane <kdakhane@gmail.com> Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include')
-rw-r--r--include/net/inet_timewait_sock.h3
1 files changed, 3 insertions, 0 deletions
diff --git a/include/net/inet_timewait_sock.h b/include/net/inet_timewait_sock.h
index b801ade2295..79f67eae8a7 100644
--- a/include/net/inet_timewait_sock.h
+++ b/include/net/inet_timewait_sock.h
@@ -201,6 +201,9 @@ extern void inet_twsk_put(struct inet_timewait_sock *tw);
extern int inet_twsk_unhash(struct inet_timewait_sock *tw);
+extern int inet_twsk_bind_unhash(struct inet_timewait_sock *tw,
+ struct inet_hashinfo *hashinfo);
+
extern struct inet_timewait_sock *inet_twsk_alloc(const struct sock *sk,
const int state);