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| author | Norbert Slusarek <nslusarek@gmx.net> | 2021-02-05 13:14:05 +0100 |
|---|---|---|
| committer | Jakub Kicinski <kuba@kernel.org> | 2021-02-06 15:03:31 -0800 |
| commit | 3d0bc44d39bca615b72637e340317b7899b7f911 (patch) | |
| tree | 406396f7f0faf47889c6c7c37b77029dc0e6fd31 /net/vmw_vsock/af_vsock.c | |
| parent | 5d1cbcc990f18edaddddef26677073c4e6fad7b7 (diff) | |
| download | linux-stable-3d0bc44d39bca615b72637e340317b7899b7f911.tar.gz linux-stable-3d0bc44d39bca615b72637e340317b7899b7f911.tar.bz2 linux-stable-3d0bc44d39bca615b72637e340317b7899b7f911.zip | |
net/vmw_vsock: improve locking in vsock_connect_timeout()
A possible locking issue in vsock_connect_timeout() was recognized by
Eric Dumazet which might cause a null pointer dereference in
vsock_transport_cancel_pkt(). This patch assures that
vsock_transport_cancel_pkt() will be called within the lock, so a race
condition won't occur which could result in vsk->transport to be set to NULL.
Fixes: 380feae0def7 ("vsock: cancel packets when failing to connect")
Reported-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: Norbert Slusarek <nslusarek@gmx.net>
Reviewed-by: Stefano Garzarella <sgarzare@redhat.com>
Link: https://lore.kernel.org/r/trinity-f8e0937a-cf0e-4d80-a76e-d9a958ba3ef1-1612535522360@3c-app-gmx-bap12
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Diffstat (limited to 'net/vmw_vsock/af_vsock.c')
| -rw-r--r-- | net/vmw_vsock/af_vsock.c | 5 |
1 files changed, 1 insertions, 4 deletions
diff --git a/net/vmw_vsock/af_vsock.c b/net/vmw_vsock/af_vsock.c index cb81cfb47a78..4ea301fc2bf0 100644 --- a/net/vmw_vsock/af_vsock.c +++ b/net/vmw_vsock/af_vsock.c @@ -1243,7 +1243,6 @@ static void vsock_connect_timeout(struct work_struct *work) { struct sock *sk; struct vsock_sock *vsk; - int cancel = 0; vsk = container_of(work, struct vsock_sock, connect_work.work); sk = sk_vsock(vsk); @@ -1254,11 +1253,9 @@ static void vsock_connect_timeout(struct work_struct *work) sk->sk_state = TCP_CLOSE; sk->sk_err = ETIMEDOUT; sk->sk_error_report(sk); - cancel = 1; + vsock_transport_cancel_pkt(vsk); } release_sock(sk); - if (cancel) - vsock_transport_cancel_pkt(vsk); sock_put(sk); } |