On Tue, Apr 10, 2018 at 3:40 AM, Michael S. Tsirkin <mst@xxxxxxxxxx> wrote:
> From: Stefan Hajnoczi <stefanha@xxxxxxxxxx>
>
> Commit d65026c6c62e7d9616c8ceb5a53b68bcdc050525 ("vhost: validate log
> when IOTLB is enabled") introduced a regression. The logic was
> originally:
>
> if (vq->iotlb)
> return 1;
> return A && B;
>
> After the patch the short-circuit logic for A was inverted:
>
> if (A || vq->iotlb)
> return A;
> return B;
>
> The correct logic is:
>
> if (!A || vq->iotlb)
> return A;
> return B;
>
> Reported-by: syzbot+65a84dde0214b0387ccd@xxxxxxxxxxxxxxxxxxxxxxxxx
> Cc: Jason Wang <jasowang@xxxxxxxxxx>
> Signed-off-by: Stefan Hajnoczi <stefanha@xxxxxxxxxx>
> Acked-by: Michael S. Tsirkin <mst@xxxxxxxxxx>
>
> ---
> drivers/vhost/vhost.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
NACK
I will send a v2 with cleaner logic as suggested by Linus.
Stefan
