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net: Check if nc is NULL in qemu_get_vnet_hdr_len()

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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: 4b52d63249 ("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>
This commit is contained in:
Akihiko Odaki 2024-08-17 16:00:43 +09:00 • committed by Jason Wang
parent 75fe36b4e8
commit 76240dd2a3
1 changed files with 4 additions and 0 deletions
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4
net/net.c
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@ -542,6 +542,10 @@ void qemu_set_offload(NetClientState *nc, int csum, int tso4, int tso6,
int qemu_get_vnet_hdr_len(NetClientState *nc) int qemu_get_vnet_hdr_len(NetClientState *nc)
{ {
if (!nc) {
return 0;
}
return nc->vnet_hdr_len; return nc->vnet_hdr_len;
} }