linux-kernel - Re: [ivtv-devel] 2.6.29: ivtv-vbi.c: divide-by-zero in compress_sliced

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Message-ID: <49D0C9F1.6020006@rtr.ca>
Date:	Mon, 30 Mar 2009 09:32:33 -0400
From:	Mark Lord <lkml@....ca>
To:	Hans Verkuil <hverkuil@...all.nl>
Cc:	ivtv-devel@...vdriver.org,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	v4l-dvb-maintainer@...uxtv.org, g.liakhovetski@....de,
	video4linux-list@...hat.com
Subject: Re: [ivtv-devel] 2.6.29: ivtv-vbi.c: divide-by-zero in compress_sliced_buf()

Mark Lord wrote:
> Hans Verkuil wrote:
>> On Monday 30 March 2009 04:59:34 Mark Lord wrote:
>>> The changes to line_size in 2.6.29 now cause
>>> attempts to record from my PVR250 cards (MythTV)
>>> to die with a divide by zero error in ivtv-vbi.c.
>>>
>>> The value of "line_size" in compress_sliced_buf() is zero.
>>
>> Weird. That should never be zero. Can you mail me the ivtv 
>> initialization log from dmesg? I need the bit between 'ivtv: Start 
>> initialization' and 'ivtv: End initialization'.
> ..
> 
> Sent.
..

For what it's worth, I did try patching that function to detect
a line_size of zero, and replace it on the fly with a more likely value.
This prevented the crash, but the recorded video was very dark, as if
colour controls had not be initialized.  That could be another clue.

Cheers
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