linux-kernel - [35/40] asix: fix infinite loop in rx

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Date:	Tue, 10 Jan 2012 13:45:48 -0800
From:	Greg KH <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	torvalds@...ux-foundation.org, akpm@...ux-foundation.org,
	alan@...rguk.ukuu.org.uk, Aurelien Jacobs <aurel@...age.org>,
	Jussi Kivilinna <jussi.kivilinna@...et.fi>,
	"David S. Miller" <davem@...emloft.net>
Subject: [35/40] asix: fix infinite loop in rx_fixup()

3.0-stable review patch.  If anyone has any objections, please let me know.

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

From: Aurelien Jacobs <aurel@...age.org>

commit 6c15d74defd38e7e7f8805392578b7a1d508097e upstream.

At this point if skb->len happens to be 2, the subsequant skb_pull(skb, 4)
call won't work and the skb->len won't be decreased and won't ever reach 0,
resulting in an infinite loop.

With an ASIX 88772 under heavy load, without this patch, rx_fixup() reaches
an infinite loop in less than a minute. With this patch applied,
no infinite loop even after hours of heavy load.

Signed-off-by: Aurelien Jacobs <aurel@...age.org>
Cc: Jussi Kivilinna <jussi.kivilinna@...et.fi>
Signed-off-by: David S. Miller <davem@...emloft.net>

---
 drivers/net/usb/asix.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/net/usb/asix.c
+++ b/drivers/net/usb/asix.c
@@ -371,7 +371,7 @@ static int asix_rx_fixup(struct usbnet *

 		skb_pull(skb, (size + 1) & 0xfffe);

-		if (skb->len == 0)
+		if (skb->len < sizeof(header))
 			break;

 		head = (u8 *) skb->data;

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