linux-kernel - [060/146] tcp: len check is unnecessarily devastating, change to WARN

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Date:	Wed, 01 Jun 2011 16:59:56 +0900
From:	Greg KH <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...nel.org
Cc:	stable-review@...nel.org, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
	Ilpo Järvinen <ilpo.jarvinen@...sinki.fi>,
	"David S. Miller" <davem@...emloft.net>,
	Greg Kroah-Hartman <gregkh@...e.de>
Subject: [060/146] tcp: len check is unnecessarily devastating, change to WARN_ON

2.6.38-stable review patch.  If anyone has any objections, please let us know.

------------------


From: =?UTF-8?q?Ilpo=20J=C3=A4rvinen?= <ilpo.jarvinen@...sinki.fi>

[ Upstream commit 2fceec13375e5d98ef033c6b0ee03943fc460950 ]

All callers are prepared for alloc failures anyway, so this error
can safely be boomeranged to the callers domain without super
bad consequences. ...At worst the connection might go into a state
where each RTO tries to (unsuccessfully) re-fragment with such
a mis-sized value and eventually dies.

Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@...sinki.fi>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>
---
 net/ipv4/tcp_output.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- a/net/ipv4/tcp_output.c
+++ b/net/ipv4/tcp_output.c
@@ -1003,7 +1003,8 @@ int tcp_fragment(struct sock *sk, struct
 	int nlen;
 	u8 flags;
 
-	BUG_ON(len > skb->len);
+	if (WARN_ON(len > skb->len))
+		return -EINVAL;
 
 	nsize = skb_headlen(skb) - len;
 	if (nsize < 0)


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