af_unix: Fix data race around sk->sk_err.
authorKuniyuki Iwashima <kuniyu@amazon.com>
Sat, 2 Sep 2023 00:27:08 +0000 (17:27 -0700)
committerDavid S. Miller <davem@davemloft.net>
Mon, 4 Sep 2023 10:06:16 +0000 (11:06 +0100)
commitb192812905e4b134f7b7994b079eb647e9d2d37e
tree332b4a89cd819ad45d81d5465c093852942323af
parentafe8764f76346ba838d4f162883e23d2fcfaa90e
af_unix: Fix data race around sk->sk_err.

As with sk->sk_shutdown shown in the previous patch, sk->sk_err can be
read locklessly by unix_dgram_sendmsg().

Let's use READ_ONCE() for sk_err as well.

Note that the writer side is marked by commit cc04410af7de ("af_unix:
annotate lockless accesses to sk->sk_err").

Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2")
Signed-off-by: Kuniyuki Iwashima <kuniyu@amazon.com>
Reviewed-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
net/core/sock.c