On Mon, Feb 21, 2022 at 12:49 PM Stefano Garzarella <sgarzare@xxxxxxxxxx> wrote: > > vhost_vsock_stop() calls vhost_dev_check_owner() to check the device > ownership. It expects current->mm to be valid. > > vhost_vsock_stop() is also called by vhost_vsock_dev_release() when > the user has not done close(), so when we are in do_exit(). In this > case current->mm is invalid and we're releasing the device, so we > should clean it anyway. > > Let's check the owner only when vhost_vsock_stop() is called > by an ioctl. > > Fixes: 433fc58e6bf2 ("VSOCK: Introduce vhost_vsock.ko") > Cc: stable@xxxxxxxxxxxxxxx > Reported-by: syzbot+1e3ea63db39f2b4440e0@xxxxxxxxxxxxxxxxxxxxxxxxx > Signed-off-by: Stefano Garzarella <sgarzare@xxxxxxxxxx> > --- > drivers/vhost/vsock.c | 14 ++++++++------ > 1 file changed, 8 insertions(+), 6 deletions(-) Reported-and-tested-by: syzbot+0abd373e2e50d704db87@xxxxxxxxxxxxxxxxxxxxxxxxx Reported-and-tested-by: syzbot+3140b17cb44a7b174008@xxxxxxxxxxxxxxxxxxxxxxxxx