linux-kernel - Re: [PATCH] lib/vsprintf.c: increase the size of the field

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Date:	Wed, 9 Sep 2015 09:39:28 -0400
From:	Tejun Heo <tj@...nel.org>
To:	Maurizio Lombardi <mlombard@...hat.com>
Cc:	akpm@...ux-foundation.org, linux@...musvillemoes.dk,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] lib/vsprintf.c: increase the size of the field_width
 variable

On Wed, Sep 09, 2015 at 12:13:10PM +0200, Maurizio Lombardi wrote:
> When printing a bitmap using the "%*pb[l]" printk format
> a 16 bit variable (field_width) is used to store the size of the bitmap.
> In some cases 16 bits are not sufficient, the variable overflows and
> printk does not work as expected.
> 
> This patch fixes the problem by changing the type of field_width to s32.
> 
> How to reproduce the bug:
> 
> 1.load scsi_debug
> # modprobe scsi-debug dev_size_mb=256 lbpu=1 lbpws10=1
> 
> 2.create VG
> # vgcreate tsvg /dev/sdb
>   Physical volume "/dev/sdb" successfully created
>   Volume group "tsvg" successfully created
> 
> 3. Bitmap should be set, but still empty
> # cat /sys/bus/pseudo/drivers/scsi_debug/map
> 
> Expected results:
> # cat /sys/bus/pseudo/drivers/scsi_debug/map
> 0-15
> 
> Signed-off-by: Maurizio Lombardi <mlombard@...hat.com>

Acked-by: Tejun Heo <tj@...nel.org>

Thanks.

-- 
tejun
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