diff options
| author | Kuniyuki Iwashima <kuniyu@amazon.com> | 2024-06-04 19:52:31 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2024-06-21 15:38:19 +0300 |
| commit | 3d25de6486f43a561d7443027734fde94551a130 (patch) | |
| tree | 0c247511aabde6f31da56ee1df396fe1a070fe2a /net | |
| parent | 484e036e1a2c1851c3159c4983b29116acc2624b (diff) | |
| download | linux-3d25de6486f43a561d7443027734fde94551a130.tar.xz | |
af_unix: Annotate data-race of sk->sk_state in unix_stream_connect().
[ Upstream commit a9bf9c7dc6a5899c01cb8f6e773a66315a5cd4b7 ]
As small optimisation, unix_stream_connect() prefetches the client's
sk->sk_state without unix_state_lock() and checks if it's TCP_CLOSE.
Later, sk->sk_state is checked again under unix_state_lock().
Let's use READ_ONCE() for the first check and TCP_CLOSE directly for
the second check.
Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2")
Signed-off-by: Kuniyuki Iwashima <kuniyu@amazon.com>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'net')
| -rw-r--r-- | net/unix/af_unix.c | 7 |
1 files changed, 2 insertions, 5 deletions
diff --git a/net/unix/af_unix.c b/net/unix/af_unix.c index 4a43091c9541..53d67d540a57 100644 --- a/net/unix/af_unix.c +++ b/net/unix/af_unix.c @@ -1491,7 +1491,6 @@ static int unix_stream_connect(struct socket *sock, struct sockaddr *uaddr, struct sk_buff *skb = NULL; long timeo; int err; - int st; err = unix_validate_addr(sunaddr, addr_len); if (err) @@ -1577,9 +1576,7 @@ restart: Well, and we have to recheck the state after socket locked. */ - st = sk->sk_state; - - switch (st) { + switch (READ_ONCE(sk->sk_state)) { case TCP_CLOSE: /* This is ok... continue with connect */ break; @@ -1594,7 +1591,7 @@ restart: unix_state_lock_nested(sk, U_LOCK_SECOND); - if (sk->sk_state != st) { + if (sk->sk_state != TCP_CLOSE) { unix_state_unlock(sk); unix_state_unlock(other); sock_put(other); |