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net: add debugging checks in skb_attempt_defer_free() 

Make sure skbs that are stored in softnet_data.defer_list
do not have a dst attached.

Also make sure the the skb was orphaned.

Link: https://lore.kernel.org/netdev/CANn89iJuEVe72bPmEftyEJHLzzN=QNR2yueFjTxYXCEpS5S8HQ@mail.gmail.com/T/
Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet 2023-04-21 09:43:53 +00:00 committed by David S. Miller
parent 19c60fdee5
commit e8e1ce8454
1 changed files with 3 additions and 0 deletions
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3
net/core/skbuff.c
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@ -6881,6 +6881,9 @@ nodefer: __kfree_skb(skb);
return; return;
} }
DEBUG_NET_WARN_ON_ONCE(skb_dst(skb));
DEBUG_NET_WARN_ON_ONCE(skb->destructor);
sd = &per_cpu(softnet_data, cpu); sd = &per_cpu(softnet_data, cpu);
defer_max = READ_ONCE(sysctl_skb_defer_max); defer_max = READ_ONCE(sysctl_skb_defer_max);
if (READ_ONCE(sd->defer_count) >= defer_max) if (READ_ONCE(sd->defer_count) >= defer_max)