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net: use DEBUG_NET_WARN_ON_ONCE() in dev_loopback_xmit()

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One check in dev_loopback_xmit() has not caught issues
in the past.

Keep it for CONFIG_DEBUG_NET=y builds only.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Eric Dumazet 2022-06-08 09:04:32 -07:00 committed by Jakub Kicinski
parent 63fbdd3c77
commit 76458faeb2
1 changed files with 1 additions and 1 deletions
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2
net/core/dev.c
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@ -3925,7 +3925,7 @@ int dev_loopback_xmit(struct net *net, struct sock *sk, struct sk_buff *skb)
skb->pkt_type = PACKET_LOOPBACK;
if (skb->ip_summed == CHECKSUM_NONE)
skb->ip_summed = CHECKSUM_UNNECESSARY;
WARN_ON(!skb_dst(skb));
DEBUG_NET_WARN_ON_ONCE(!skb_dst(skb));
skb_dst_force(skb);
netif_rx(skb);
return 0;