[Stable-9.1.2 20/58] net: Check if nc is NULL in qemu_get_vnet_hdr_len()

[Michael Tokarev]

From: Akihiko Odaki <akihiko.odaki@daynix.com>

A netdev may not have a peer specified, resulting in NULL. We should
make it behave like /dev/null in such a case instead of letting it
cause segmentatin fault.

Fixes: 4b52d63249a5 ("tap: Remove qemu_using_vnet_hdr()")
Cc: qemu-stable@nongnu.org
Reported-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Signed-off-by: Akihiko Odaki <akihiko.odaki@daynix.com>
Tested-by; Jonathan Cameron <Jonathan.Cameron@huawei.com>
Acked-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>
(cherry picked from commit 76240dd2a37c7b361740616a7d6080beafdb8a71)
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>

diff --git a/net/net.c b/net/net.c
index fc1125111c..264c4e9c5c 100644
--- a/net/net.c
+++ b/net/net.c
@@ -542,6 +542,10 @@ void qemu_set_offload(NetClientState *nc, int csum, int 
tso4, int tso6,
 
 int qemu_get_vnet_hdr_len(NetClientState *nc)
 {
+    if (!nc) {
+        return 0;
+    }
+
     return nc->vnet_hdr_len;
 }
 
-- 
2.39.5