From: Eric Dumazet <edumazet@google.com>
Date: Fri, 21 Apr 2023 09:43:53 +0000 (+0000)
Subject: net: add debugging checks in skb_attempt_defer_free()
X-Git-Tag: v6.6.17~4755^2~63^2~4
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=e8e1ce8454c9cc8ad2e4422bef346428e52455e3;p=platform%2Fkernel%2Flinux-rpi.git

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>
---

diff --git a/net/core/skbuff.c b/net/core/skbuff.c
index 0d998806b377..bd815a00d2af 100644
--- a/net/core/skbuff.c
+++ b/net/core/skbuff.c
@@ -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)