From: Lennert Buytenhek <buytenh@marvell.com>
Date: Tue, 11 Nov 2008 05:45:05 +0000 (-0800)
Subject: net: fix setting of skb->tail in skb_recycle_check()
X-Git-Tag: firefly_0821_release~16885^2~2
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=5cd33db2120b5ce972568711156f91da83bff2d7;p=firefly-linux-kernel-4.4.55.git

net: fix setting of skb->tail in skb_recycle_check()

Since skb_reset_tail_pointer() reads skb->data, we need to set
skb->data before calling skb_reset_tail_pointer().  This was causing
spurious skb_over_panic()s from skb_put() being called on a recycled
skb that had its skb->tail set to beyond where it should have been.

Bug report from Peter van Valderen <linux@ddcrew.com>.

Signed-off-by: Lennert Buytenhek <buytenh@marvell.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---

diff --git a/net/core/skbuff.c b/net/core/skbuff.c
index ebb6b94f8af2..d49ef8301b5b 100644
--- a/net/core/skbuff.c
+++ b/net/core/skbuff.c
@@ -486,8 +486,8 @@ int skb_recycle_check(struct sk_buff *skb, int skb_size)
 	shinfo->frag_list = NULL;
 
 	memset(skb, 0, offsetof(struct sk_buff, tail));
-	skb_reset_tail_pointer(skb);
 	skb->data = skb->head + NET_SKB_PAD;
+	skb_reset_tail_pointer(skb);
 
 	return 1;
 }