vsock/virtio: Initialization of the dangling pointer occurring in vsk->trans

ImV4bel · mstsirkin · commit 6ca575374dd9 · 2024-11-06T03:30:20.000-05:00
During loopback communication, a dangling pointer can be created in vsk->trans, potentially leading to a Use-After-Free condition. This issue is resolved by initializing vsk->trans to NULL. Cc: stable <stable@kernel.org> Fixes: 06a8fc7 ("VSOCK: Introduce virtio_vsock_common.ko") Signed-off-by: Hyunwoo Kim <v4bel@theori.io> Signed-off-by: Wongi Lee <qwerty@theori.io> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Message-Id: <2024102245-strive-crib-c8d3@gregkh> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
diff --git a/net/vmw_vsock/virtio_transport_common.c b/net/vmw_vsock/virtio_transport_common.c
@@ -1109,6 +1109,7 @@ void virtio_transport_destruct(struct vsock_sock *vsk)
 	struct virtio_vsock_sock *vvs = vsk->trans;
 
 	kfree(vvs);
+	vsk->trans = NULL;
 }
 EXPORT_SYMBOL_GPL(virtio_transport_destruct);
 

Original file line number	Diff line number	Diff line change
`@@ -1109,6 +1109,7 @@ void virtio_transport_destruct(struct vsock_sock *vsk)`
`1109`	`1109`	`struct virtio_vsock_sock *vvs = vsk->trans;`
`1110`	`1110`
`1111`	`1111`	`kfree(vvs);`
	`1112`	`+ vsk->trans = NULL;`
`1112`	`1113`	`}`
`1113`	`1114`	`EXPORT_SYMBOL_GPL(virtio_transport_destruct);`
`1114`	`1115`