From: Mark Salyzyn <salyzyn@android.com>
To: linux-kernel@vger.kernel.org
Cc: Mark Salyzyn <salyzyn@android.com>,
"David S. Miller" <davem@davemloft.net>,
Al Viro <viro@zeniv.linux.org.uk>,
David Howells <dhowells@redhat.com>,
Ying Xue <ying.xue@windriver.com>, Christoph Hellwig <hch@lst.de>,
netdev@vger.kernel.org
Subject: net/unix: sk_socket can disappear when state is unlocked
Date: Thu, 21 May 2015 09:25:32 -0700 [thread overview]
Message-ID: <1432225541-28498-1-git-send-email-salyzyn@android.com> (raw)
got a rare NULL pointer dereference in clear_bit
Signed-off-by: Mark Salyzyn <salyzyn@android.com>
---
net/unix/af_unix.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/net/unix/af_unix.c b/net/unix/af_unix.c
index 5266ea7..37a8925 100644
--- a/net/unix/af_unix.c
+++ b/net/unix/af_unix.c
@@ -1880,6 +1880,11 @@ static long unix_stream_data_wait(struct sock *sk, long timeo,
unix_state_unlock(sk);
timeo = freezable_schedule_timeout(timeo);
unix_state_lock(sk);
+
+ /* sk_socket may have been killed while unlocked */
+ if (!sk->sk_socket)
+ break;
+
clear_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
}
--
2.2.0.rc0.207.ga3a616c
next reply other threads:[~2015-05-21 16:25 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-05-21 16:25 Mark Salyzyn [this message]
2015-05-22 9:50 ` net/unix: sk_socket can disappear when state is unlocked Hannes Frederic Sowa
2015-05-22 14:51 ` Mark Salyzyn
2015-05-22 15:35 ` Hannes Frederic Sowa
2015-05-22 16:24 ` Mark Salyzyn
2015-05-22 18:16 ` Hannes Frederic Sowa
2015-05-22 19:59 ` Mark Salyzyn
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