From: Patrick McHardy <kaber@trash.net>
Date: Wed, 17 Apr 2013 06:46:59 +0000 (+0000)
Subject: netlink: don't orphan skb in netlink_trim()
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=1298ca4671acb10310baa550ed044c553e3a3387;p=GitHub%2FLineageOS%2FG12%2Fandroid_kernel_amlogic_linux-4.9.git

netlink: don't orphan skb in netlink_trim()

Netlink doesn't account skbs to the sending socket, so the there's no
need to orphan the skb before trimming it.

Removing the skb_orphan() call is required for mmap'ed netlink, which uses
a netlink specific skb destructor that must not be invoked before the
final freeing of the skb.

Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
---

diff --git a/net/netlink/af_netlink.c b/net/netlink/af_netlink.c
index 978a61f7c87f..26779c24b1d4 100644
--- a/net/netlink/af_netlink.c
+++ b/net/netlink/af_netlink.c
@@ -851,7 +851,7 @@ static struct sk_buff *netlink_trim(struct sk_buff *skb, gfp_t allocation)
 {
 	int delta;
 
-	skb_orphan(skb);
+	WARN_ON(skb->sk != NULL);
 
 	delta = skb->end - skb->tail;
 	if (delta * 2 < skb->truesize)