linux-kernel - Re: [PATCH] video: fbdev: neofb: fix memory leak in neo_scan

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Date:   Fri, 10 Jul 2020 16:23:48 +0200
From:   Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>
To:     Evgeny Novikov <novikov@...ras.ru>
Cc:     Jani Nikula <jani.nikula@...el.com>,
        Mike Rapoport <rppt@...ux.ibm.com>,
        Daniel Vetter <daniel.vetter@...ll.ch>,
        Andrew Morton <akpm@...ux-foundation.org>,
        dri-devel@...ts.freedesktop.org, linux-fbdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, ldv-project@...uxtesting.org
Subject: Re: [PATCH] video: fbdev: neofb: fix memory leak in
 neo_scan_monitor()


On 6/30/20 9:54 PM, Evgeny Novikov wrote:
> neofb_probe() calls neo_scan_monitor() that can successfully allocate a
> memory for info->monspecs.modedb and proceed to case 0x03. There it does
> not free the memory and returns -1. neofb_probe() goes to label
> err_scan_monitor, thus, it does not free this memory through calling
> fb_destroy_modedb() as well. We can not go to label err_init_hw since
> neo_scan_monitor() can fail during memory allocation. So, the patch frees
> the memory directly for case 0x03.
> 
> Found by Linux Driver Verification project (linuxtesting.org).
> 
> Signed-off-by: Evgeny Novikov <novikov@...ras.ru>

Applied to drm-misc-next tree, thanks.

Best regards,
--
Bartlomiej Zolnierkiewicz
Samsung R&D Institute Poland
Samsung Electronics

> ---
>  drivers/video/fbdev/neofb.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/drivers/video/fbdev/neofb.c b/drivers/video/fbdev/neofb.c
> index f5a676bfd67a..09a20d4ab35f 100644
> --- a/drivers/video/fbdev/neofb.c
> +++ b/drivers/video/fbdev/neofb.c
> @@ -1819,6 +1819,7 @@ static int neo_scan_monitor(struct fb_info *info)
>  #else
>  		printk(KERN_ERR
>  		       "neofb: Only 640x480, 800x600/480 and 1024x768 panels are currently supported\n");
> +		kfree(info->monspecs.modedb);
>  		return -1;
>  #endif
>  	default:
>