linux-kernel - Re: [PATCH] staging: sm7xxfb: copy name of the device before calling smtc_alloc_fb

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Date:	Mon, 6 Aug 2012 17:12:48 +0300
From:	Dan Carpenter <dan.carpenter@...cle.com>
To:	Devendra Naga <develkernel412222@...il.com>
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Javier Muñoz <jmunhoz@...lia.com>,
	Paul Gortmaker <paul.gortmaker@...driver.com>,
	Devendra Naga <devendra.aaru@...il.com>,
	devel@...verdev.osuosl.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] staging: sm7xxfb: copy name of the device before calling
 smtc_alloc_fb_info

On Sat, Aug 04, 2012 at 11:06:12PM +0545, Devendra Naga wrote:
> as we do a strcpy(smdrv_ptr->fb_struct->fix->id, name), and the name here in
> sm7xxx_probe is not having any assignment, and which leads to copying of the garbage value
> into the id field of the fix struct of fb interface struct. fix it by copying the name before
> calling alloc_fbinfo
> 
> Signed-off-by: Devendra Naga <develkernel412222@...il.com>
> ---
>  Only compile tested
>  This patch is not tested using the hardware... if any one is having this hardware, i request them to
> please test this
>  drivers/staging/sm7xxfb/sm7xxfb.c |    7 ++++---
>  1 file changed, 4 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/staging/sm7xxfb/sm7xxfb.c b/drivers/staging/sm7xxfb/sm7xxfb.c
> index 1c1780c..d3957ef 100644
> --- a/drivers/staging/sm7xxfb/sm7xxfb.c
> +++ b/drivers/staging/sm7xxfb/sm7xxfb.c
> @@ -798,16 +798,17 @@ static int __devinit smtcfb_pci_probe(struct pci_dev *pdev,
>  	if (err)
>  		return err;
>  
> +	sprintf(name, "sm%Xfb", ent->device);
> +
>  	sfb = smtc_alloc_fb_info(pdev, name);
>  
> +	sfb->chip_id = ent->device;
> +
>  	if (!sfb) {

Thanks for fixing this, and well done for spotting the bug.

There is a dereference before the check here, but I see you resent
this in another thread.  Next time could you respond to the
original with a message which says to not apply it.

regards,
dan carpenter


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