Commit e8e1ce84 authored by Eric Dumazet's avatar Eric Dumazet Committed by David S. Miller
Browse files

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: default avatarEric Dumazet <edumazet@google.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 19c60fde

net/core/skbuff.c

+3 −0
Original line number Diff line number Diff line
@@ -6881,6 +6881,9 @@ nodefer: __kfree_skb(skb); 
		return;

	}



	DEBUG_NET_WARN_ON_ONCE(skb_dst(skb));

	DEBUG_NET_WARN_ON_ONCE(skb->destructor);



	sd = &per_cpu(softnet_data, cpu);

	defer_max = READ_ONCE(sysctl_skb_defer_max);

	if (READ_ONCE(sd->defer_count) >= defer_max)