af_unix: Use skb_queue_empty_lockless() in unix_release_sock().

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[ Upstream commit 83690b82d2 ]

If the socket type is SOCK_STREAM or SOCK_SEQPACKET, unix_release_sock()
checks the length of the peer socket's recvq under unix_state_lock().

However, unix_stream_read_generic() calls skb_unlink() after releasing
the lock.  Also, for SOCK_SEQPACKET, __skb_try_recv_datagram() unlinks
skb without unix_state_lock().

Thues, unix_state_lock() does not protect qlen.

Let's use skb_queue_empty_lockless() in unix_release_sock().

Fixes: 1da177e4c3 ("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>

...

This commit is contained in:

Kuniyuki Iwashima 2024-06-04 09:52:39 -07:00 • committed by Greg Kroah-Hartman

parent f1683d07eb

commit 471ec7b77a

1 changed files with 1 additions and 1 deletions

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net/unix/af_unix.c

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