[Qemu-devel] [PATCH 1/4] net: tap-linux: Fix unhelpful error message

[Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>]

From: Luiz Capitulino <lcapitulino@redhat.com>

I'm getting:

    could not configure /dev/net/tun (tap%d): Operation not permitted

When the ioctl() fails, ifr.ifr_name will most likely not be overwritten.
So we better only use it when ifname contains a string.

Signed-off-by: Luiz Capitulino <lcapitulino@redhat.com>
Signed-off-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
---
 net/tap-linux.c |    6 +++++-
 1 files changed, 5 insertions(+), 1 deletions(-)

diff --git a/net/tap-linux.c b/net/tap-linux.c
index ff8cad0..41d581b 100644
--- a/net/tap-linux.c
+++ b/net/tap-linux.c
@@ -73,7 +73,11 @@ int tap_open(char *ifname, int ifname_size, int *vnet_hdr, int vnet_hdr_required
         pstrcpy(ifr.ifr_name, IFNAMSIZ, "tap%d");
     ret = ioctl(fd, TUNSETIFF, (void *) &ifr);
     if (ret != 0) {
-        error_report("could not configure %s (%s): %m", PATH_NET_TUN, ifr.ifr_name);
+        if (ifname[0] != '\0') {
+            error_report("could not configure %s (%s): %m", PATH_NET_TUN, ifr.ifr_name);
+        } else {
+            error_report("could not configure %s: %m", PATH_NET_TUN);
+        }
         close(fd);
         return -1;
     }
-- 
1.7.7