[PATCH] net: Check if nc is NULL in qemu_get_vnet_hdr_len()

[Akihiko Odaki]

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()")
Reported-by: Jonathan Cameron <jonathan.came...@huawei.com>
Signed-off-by: Akihiko Odaki <akihiko.od...@daynix.com>
---
 net/net.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/net/net.c b/net/net.c
index 6938da05e077..4c21d91f9450 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;
 }
 

---
base-commit: 31669121a01a14732f57c49400bc239cf9fd505f
change-id: 20240817-net-dc461895a295

Best regards,
-- 
Akihiko Odaki <akihiko.od...@daynix.com>