linux-kernel - Re: 3.4.0-rc2: skb_put() -> skb_over

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Message-ID: <1334696031.2472.50.camel@edumazet-glaptop>
Date:	Tue, 17 Apr 2012 22:53:51 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	David Miller <davem@...emloft.net>
Cc:	a.beregalov@...il.com, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: 3.4.0-rc2: skb_put() -> skb_over_panic

On Tue, 2012-04-17 at 16:47 -0400, David Miller wrote:
> From: Eric Dumazet <eric.dumazet@...il.com>
> Date: Tue, 17 Apr 2012 22:45:06 +0200
> 
> > Could you check if commit a21d45726acacc963d8baddf74607d9b74e2b723
> > (tcp: avoid order-1 allocations on wifi and tx path)
> > was in your tree ?
> 
> I was about to say that I think this is the guilty commit too.
> 
> Good thing I held off the -stable submission of that change
> for a bit :-)

Fix should be easy I think, but yes you can hold stable submission of
course.

diff --git a/net/ipv4/tcp_output.c b/net/ipv4/tcp_output.c
index 376b2cf..7ac6423 100644
--- a/net/ipv4/tcp_output.c
+++ b/net/ipv4/tcp_output.c
@@ -1096,6 +1096,7 @@ static void __pskb_trim_head(struct sk_buff *skb, int len)
 	eat = min_t(int, len, skb_headlen(skb));
 	if (eat) {
 		__skb_pull(skb, eat);
+		skb->avail_size -= eat;
 		len -= eat;
 		if (!len)
 			return;


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