vhost: fix infinite loop on error path
file.index is unsigned, hence 'while (--file.index >= 0)'
will loop > forever. Change to while (file.index-- > 0).
Reported-by: Jes Sorensen <Jes.Sorensen@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
diff --git a/hw/vhost_net.c b/hw/vhost_net.c
index 4a7b819..c068be1 100644
--- a/hw/vhost_net.c
+++ b/hw/vhost_net.c
@@ -151,7 +151,7 @@
return 0;
fail:
file.fd = -1;
- while (--file.index >= 0) {
+ while (file.index-- > 0) {
int r = ioctl(net->dev.control, VHOST_NET_SET_BACKEND, &file);
assert(r >= 0);
}
