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vsock: prevent unnecessary refcnt inc for nonblocking connect 

[ Upstream commit c7cd82b905 ]

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: d021c34405 ("VSOCK: Introduce VM Sockets")
Reviewed-by: Stefano Garzarella <sgarzare@redhat.com>
Signed-off-by: Eiichi Tsukata <eiichi.tsukata@nutanix.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Eiichi Tsukata 2021-11-09 00:15:02 +00:00 committed by Greg Kroah-Hartman
parent 72aca95f95
commit b2d1b6624b
1 changed files with 2 additions and 0 deletions
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2
net/vmw_vsock/af_vsock.c
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@ -1151,6 +1151,8 @@ 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 == TCP_LISTEN) ||