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| author | Kuniyuki Iwashima <kuniyu@amazon.com> | 2022-06-05 16:23:25 -0700 |
|---|---|---|
| committer | Paolo Abeni <pabeni@redhat.com> | 2022-06-07 12:07:46 +0200 |
| commit | 662a80946ce13633ae90a55379f1346c10f0c432 (patch) | |
| tree | 3d9d258ea6d32322637e142f80c91cb6425eb660 /net/unix | |
| parent | 5e74a4b3ec1816e3bbfd715d46ae29d2508079cb (diff) | |
| download | lwn-662a80946ce13633ae90a55379f1346c10f0c432.tar.gz lwn-662a80946ce13633ae90a55379f1346c10f0c432.zip | |
af_unix: Fix a data-race in unix_dgram_peer_wake_me().
unix_dgram_poll() calls unix_dgram_peer_wake_me() without `other`'s
lock held and check if its receive queue is full. Here we need to
use unix_recvq_full_lockless() instead of unix_recvq_full(), otherwise
KCSAN will report a data-race.
Fixes: 7d267278a9ec ("unix: avoid use-after-free in ep_remove_wait_queue")
Signed-off-by: Kuniyuki Iwashima <kuniyu@amazon.com>
Link: https://lore.kernel.org/r/20220605232325.11804-1-kuniyu@amazon.com
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Diffstat (limited to 'net/unix')
| -rw-r--r-- | net/unix/af_unix.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/net/unix/af_unix.c b/net/unix/af_unix.c index 654dcef7cfb3..2206e6f8902d 100644 --- a/net/unix/af_unix.c +++ b/net/unix/af_unix.c @@ -490,7 +490,7 @@ static int unix_dgram_peer_wake_me(struct sock *sk, struct sock *other) * -ECONNREFUSED. Otherwise, if we haven't queued any skbs * to other and its full, we will hang waiting for POLLOUT. */ - if (unix_recvq_full(other) && !sock_flag(other, SOCK_DEAD)) + if (unix_recvq_full_lockless(other) && !sock_flag(other, SOCK_DEAD)) return 1; if (connected) |