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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>
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@ -6881,6 +6881,9 @@ nodefer: __kfree_skb(skb);
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return;
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}
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DEBUG_NET_WARN_ON_ONCE(skb_dst(skb));
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DEBUG_NET_WARN_ON_ONCE(skb->destructor);
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sd = &per_cpu(softnet_data, cpu);
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defer_max = READ_ONCE(sysctl_skb_defer_max);
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if (READ_ONCE(sd->defer_count) >= defer_max)
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