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authorKuniyuki Iwashima <kuniyu@amazon.com>2022-06-06 02:23:25 +0300
committerPaolo Abeni <pabeni@redhat.com>2022-06-07 13:07:46 +0300
commit662a80946ce13633ae90a55379f1346c10f0c432 (patch)
tree3d9d258ea6d32322637e142f80c91cb6425eb660 /net/unix
parent5e74a4b3ec1816e3bbfd715d46ae29d2508079cb (diff)
downloadlinux-662a80946ce13633ae90a55379f1346c10f0c432.tar.xz
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.c2
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)