Avoid segfault on net_tap_init() failure

Check for fd == -1 there.

Signed-off-by: Juergen Lock <nox@jelal.kn-bremen.de>
Signed-off-by: Blue Swirl <blauwirbel@gmail.com>

1 files changed, 3 insertions, 0 deletions

diff --git a/net/tap.c b/net/tap.c
index 69c905cdc..b2e5908c3 100644
--- a/net/tap.c
+++ b/net/tap.c
@@ -399,6 +399,9 @@ int net_init_tap(QemuOpts *opts, Monitor *mon, const char *name, VLANState *vlan
         }
 
         fd = net_tap_init(opts, &vnet_hdr);
+        if (fd == -1) {
+            return -1;
+        }
     }
 
     s = net_tap_fd_init(vlan, "tap", name, fd, vnet_hdr);