This is a note to let you know that I've just added the patch titled
vsock: prevent unnecessary refcnt inc for nonblocking connect
to the 4.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
vsock-prevent-unnecessary-refcnt-inc-for-nonblocking.patch
and it can be found in the queue-4.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 2917f4fd06e117d9811717e9192aecb1a1874cac
Author: Eiichi Tsukata <eiichi.tsukata@xxxxxxxxxxx>
Date: Tue Nov 9 00:15:02 2021 +0000
vsock: prevent unnecessary refcnt inc for nonblocking connect
[ Upstream commit c7cd82b90599fa10915f41e3dd9098a77d0aa7b6 ]
Currently vosck_connect() increments sock refcount for nonblocking
socket each time it's called, which can lead to memory leak if
it's called multiple times because connect timeout function decrements
sock refcount only once.
Fixes it by making vsock_connect() return -EALREADY immediately when
sock state is already SS_CONNECTING.
Fixes: d021c344051a ("VSOCK: Introduce VM Sockets")
Reviewed-by: Stefano Garzarella <sgarzare@xxxxxxxxxx>
Signed-off-by: Eiichi Tsukata <eiichi.tsukata@xxxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/net/vmw_vsock/af_vsock.c b/net/vmw_vsock/af_vsock.c
index 8f5fec0956bd9..537d57558c216 100644
--- a/net/vmw_vsock/af_vsock.c
+++ b/net/vmw_vsock/af_vsock.c
@@ -1152,6 +1152,8 @@ static int vsock_stream_connect(struct socket *sock, struct sockaddr *addr,
* non-blocking call.
*/
err = -EALREADY;
+ if (flags & O_NONBLOCK)
+ goto out;
break;
default:
if ((sk->sk_state == VSOCK_SS_LISTEN) ||
