5.10-stable review patch. If anyone has any objections, please let me know.
------------------
From: Kuniyuki Iwashima kuniyu@amazon.com
[ Upstream commit 8a34d4e8d9742a24f74998f45a6a98edd923319b ]
The following functions read sk->sk_state locklessly and proceed only if the state is TCP_ESTABLISHED.
* unix_stream_sendmsg * unix_stream_read_generic * unix_seqpacket_sendmsg * unix_seqpacket_recvmsg
Let's use READ_ONCE() there.
Fixes: a05d2ad1c1f3 ("af_unix: Only allow recv on connected seqpacket sockets.") Fixes: 1da177e4c3f4 ("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 --- net/unix/af_unix.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-)
diff --git a/net/unix/af_unix.c b/net/unix/af_unix.c index 33dd6ed8de25d..2456170c9ddc4 100644 --- a/net/unix/af_unix.c +++ b/net/unix/af_unix.c @@ -1909,7 +1909,7 @@ static int unix_stream_sendmsg(struct socket *sock, struct msghdr *msg, goto out_err;
if (msg->msg_namelen) { - err = sk->sk_state == TCP_ESTABLISHED ? -EISCONN : -EOPNOTSUPP; + err = READ_ONCE(sk->sk_state) == TCP_ESTABLISHED ? -EISCONN : -EOPNOTSUPP; goto out_err; } else { err = -ENOTCONN; @@ -2112,7 +2112,7 @@ static int unix_seqpacket_sendmsg(struct socket *sock, struct msghdr *msg, if (err) return err;
- if (sk->sk_state != TCP_ESTABLISHED) + if (READ_ONCE(sk->sk_state) != TCP_ESTABLISHED) return -ENOTCONN;
if (msg->msg_namelen) @@ -2126,7 +2126,7 @@ static int unix_seqpacket_recvmsg(struct socket *sock, struct msghdr *msg, { struct sock *sk = sock->sk;
- if (sk->sk_state != TCP_ESTABLISHED) + if (READ_ONCE(sk->sk_state) != TCP_ESTABLISHED) return -ENOTCONN;
return unix_dgram_recvmsg(sock, msg, size, flags); @@ -2326,7 +2326,7 @@ static int unix_stream_read_generic(struct unix_stream_read_state *state, size_t size = state->size; unsigned int last_len;
- if (unlikely(sk->sk_state != TCP_ESTABLISHED)) { + if (unlikely(READ_ONCE(sk->sk_state) != TCP_ESTABLISHED)) { err = -EINVAL; goto out; }