linux-kernel - Re: [PATCH] Release efifb's colormap in efifb

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Date:	Fri, 16 Aug 2013 15:51:34 +0200
From:	David Herrmann <dh.herrmann@...il.com>
To:	Peter Jones <pjones@...hat.com>
Cc:	Catalin Marinas <catalin.marinas@....com>,
	"Alexandra N. Kossovsky" <Alexandra.Kossovsky@...etlabs.ru>,
	"linux-fbdev@...r.kernel.org" <linux-fbdev@...r.kernel.org>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Tomi Valkeinen <tomi.valkeinen@...com>,
	Jean-Christophe Plagniol-Villard <plagnioj@...osoft.com>
Subject: Re: [PATCH] Release efifb's colormap in efifb_destroy()

Hi

On Thu, Jul 25, 2013 at 5:48 PM, Peter Jones <pjones@...hat.com> wrote:
> This was found by Alexandra Kossovsky, who noted this traceback from
> kmemleak:
>
>> unreferenced object 0xffff880216fcfe00 (size 512):
>>   comm "swapper/0", pid 1, jiffies 4294895429 (age 1415.320s)
>>   hex dump (first 32 bytes):
>>     00 00 00 00 00 00 00 00 aa aa aa aa aa aa aa aa  ................
>>     55 55 55 55 55 55 55 55 ff ff ff ff ff ff ff ff  UUUUUUUU........
>>   backtrace:
>>     [<ffffffff813e415c>] kmemleak_alloc+0x21/0x3e
>>     [<ffffffff8111c17f>]
>>     kmemleak_alloc_recursive.constprop.57+0x16/0x18
>>     [<ffffffff8111e63b>] __kmalloc+0xf9/0x144
>>     [<ffffffff8123d9cf>] fb_alloc_cmap_gfp+0x47/0xe1
>>     [<ffffffff8123da77>] fb_alloc_cmap+0xe/0x10
>>     [<ffffffff81aff40a>] efifb_probe+0x3e9/0x48f
>>     [<ffffffff812c566f>] platform_drv_probe+0x34/0x5e
>>     [<ffffffff812c3e6d>] driver_probe_device+0x98/0x1b4
>>     [<ffffffff812c3fd7>] __driver_attach+0x4e/0x6f
>>     [<ffffffff812c25bf>] bus_for_each_dev+0x57/0x8a
>>     [<ffffffff812c3984>] driver_attach+0x19/0x1b
>>     [<ffffffff812c362b>] bus_add_driver+0xde/0x201
>>     [<ffffffff812c453f>] driver_register+0x8c/0x110
>>     [<ffffffff812c510d>] platform_driver_register+0x41/0x43
>>     [<ffffffff812c5127>] platform_driver_probe+0x18/0x8a
>>     [<ffffffff81aff002>] efifb_init+0x276/0x295

(CC'ing fbdev maintainers)

Your signed-off-by is missing. Apart from that:
Reviewed-by: David Herrmann <dh.herrmann@...il.com>

Regards
David

> ---
>  drivers/video/efifb.c | 1 +
>  1 file changed, 1 insertion(+)
>
> diff --git a/drivers/video/efifb.c b/drivers/video/efifb.c
> index 390b61b..1f3eab3 100644
> --- a/drivers/video/efifb.c
> +++ b/drivers/video/efifb.c
> @@ -289,6 +289,7 @@ static void efifb_destroy(struct fb_info *info)
>         if (request_mem_succeeded)
>                 release_mem_region(info->apertures->ranges[0].base,
>                                    info->apertures->ranges[0].size);
> +       fb_dealloc_cmap(&info->cmap);
>         framebuffer_release(info);
>  }
>
> --
> 1.8.3.1
>
> --
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