linux-kernel - Re: [PATCH 10/33] usb: sn9c102

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Date:	Tue, 14 Nov 2006 08:02:47 +0100
From:	Luca Risolia <luca.risolia@...dio.unibo.it>
To:	Linux Kernel <linux-kernel@...r.kernel.org>,
	Mariusz Kozlowski <m.kozlowski@...land.pl>
Subject: Re: [PATCH 10/33] usb: sn9c102_core free urb cleanup

> Hello,
>
>- usb_free_urb() cleanup
>
>Signed-off-by: Mariusz Kozlowski <m.kozlowski@...land.pl>
>
>--- linux-2.6.19-rc4-orig/drivers/media/video/sn9c102/sn9c102_core.c    2006-11-06 17:07:45.000000000 +0100
>+++ linux-2.6.19-rc4/drivers/media/video/sn9c102/sn9c102_core.c 2006-11-06 19:57:35.000000000 +0100
>@@ -775,7 +775,7 @@ static int sn9c102_start_transfer(struct
>        return 0;
> 
> free_urbs:
>-       for (i = 0; (i < SN9C102_URBS) &&  cam->urb[i]; i++)
>+       for (i = 0; i < SN9C102_URBS; i++)
>                usb_free_urb(cam->urb[i]);
> 
> free_buffers:

This patch might cause usb_free_urb() to fail if not all the URBs have been
allocated successfully: in this case, the original loop stops as soon as 
cam->urb[i] == NULL (where NULL is given from the failed allocation),
while in the second loop there might be a not null cam->urb[i+n]
pointing to an URB that has already been deallocated elsewhere.

The same bug is present in PATCH 12/33.

Best regards,
Luca Risolia

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