diff options
| author | Jason Wang <jasowang@redhat.com> | 2018-05-22 19:58:57 +0800 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2018-05-24 22:09:51 -0400 |
| commit | 1b15ad683ab42a203f98b67045b40720e99d0e9a (patch) | |
| tree | 5f9f1adbe56a008b152ffcf9fa86aa3041986b0b /net/sched | |
| parent | d681bc027a133f5c19e037f1bd3a142cffc566b4 (diff) | |
vhost: synchronize IOTLB message with dev cleanup
DaeRyong Jeong reports a race between vhost_dev_cleanup() and
vhost_process_iotlb_msg():
Thread interleaving:
CPU0 (vhost_process_iotlb_msg) CPU1 (vhost_dev_cleanup)
(In the case of both VHOST_IOTLB_UPDATE and
VHOST_IOTLB_INVALIDATE)
===== =====
vhost_umem_clean(dev->iotlb);
if (!dev->iotlb) {
ret = -EFAULT;
break;
}
dev->iotlb = NULL;
The reason is we don't synchronize between them, fixing by protecting
vhost_process_iotlb_msg() with dev mutex.
Reported-by: DaeRyong Jeong <threeearcat@gmail.com>
Fixes: 6b1e6cc7855b0 ("vhost: new device IOTLB API")
Signed-off-by: Jason Wang <jasowang@redhat.com>
Acked-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/sched')
0 files changed, 0 insertions, 0 deletions