linux-kernel - Re: [PATCH -next] video: fbdev: pxafb: Fix "WARNING: invalid free of devm

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Date:   Fri, 16 Nov 2018 21:05:32 +0100
From:   Daniel Mack <daniel@...que.org>
To:     YueHaibing <yuehaibing@...wei.com>, b.zolnierkie@...sung.com,
        robert.jarzmik@...e.fr
Cc:     linux-kernel@...r.kernel.org, linux-fbdev@...r.kernel.org,
        dri-devel@...ts.freedesktop.org
Subject: Re: [PATCH -next] video: fbdev: pxafb: Fix "WARNING: invalid free of
 devm_ allocated data"

On 16/11/2018 12:02 PM, YueHaibing wrote:
> 'info->modes' got allocated with devm_kcalloc in of_get_pxafb_display.
> 
> This gives this error message:
>    ./drivers/video/fbdev/pxafb.c:2238:2-7: WARNING: invalid free of devm_ allocated data
> 
> Signed-off-by: YueHaibing <yuehaibing@...wei.com>

Oh, yes. Thanks for spotting this!

Could you please add these lines to the patch and resubmit?


Fixes: c8f96304ec8b4 ("video: fbdev: pxafb: switch to devm_* API")
Cc: stable@...nel.org [v4.19+]
Reviewed-by: Daniel Mack <daniel@...que.org>




> ---
>   drivers/video/fbdev/pxafb.c | 4 +---
>   1 file changed, 1 insertion(+), 3 deletions(-)
> 
> diff --git a/drivers/video/fbdev/pxafb.c b/drivers/video/fbdev/pxafb.c
> index bbed039..d59c8a5 100644
> --- a/drivers/video/fbdev/pxafb.c
> +++ b/drivers/video/fbdev/pxafb.c
> @@ -2234,10 +2234,8 @@ static struct pxafb_mach_info *of_pxafb_of_mach_info(struct device *dev)
>   	if (!info)
>   		return ERR_PTR(-ENOMEM);
>   	ret = of_get_pxafb_mode_info(dev, info);
> -	if (ret) {
> -		kfree(info->modes);
> +	if (ret)
>   		return ERR_PTR(ret);
> -	}
>   
>   	/*
>   	 * On purpose, neither lccrX registers nor video memory size can be
>