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asix: fix infinite loop in rx_fixup()

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commit 6c15d74def 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@gnuage.org>
Cc: Jussi Kivilinna <jussi.kivilinna@mbnet.fi>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Aurelien Jacobs
2012-01-07 12:15:16 -08:00
committed by Greg Kroah-Hartman
parent 25c413ad00
commit 4a75c21908
1 changed files with 1 additions and 1 deletions
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2
drivers/net/usb/asix.c
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@@ -376,7 +376,7 @@ static int asix_rx_fixup(struct usbnet *dev, struct sk_buff *skb)
skb_pull(skb, (size + 1) & 0xfffe);
if (skb->len == 0)
if (skb->len < sizeof(header))
break;
head = (u8 *) skb->data;