linux-kernel - Re: [PATCH] fbcon: Fix memory leak in con2fb_release

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Message-ID: <536B62A1.1040203@ti.com>
Date:	Thu, 8 May 2014 13:55:29 +0300
From:	Tomi Valkeinen <tomi.valkeinen@...com>
To:	Masami Ichikawa <masami256@...il.com>, <plagnioj@...osoft.com>,
	<udknight@...il.com>, <gregkh@...uxfoundation.org>,
	<keithp@...thp.com>, <mika.kuoppala@...ux.intel.com>,
	<viresh.kumar@...aro.org>, <linux-kernel@...r.kernel.org>,
	<linux-fbdev@...r.kernel.org>
Subject: Re: [PATCH] fbcon: Fix memory leak in con2fb_release_oldinfo()

On 23/04/14 17:35, Masami Ichikawa wrote:
> kmemleak reported a memory leak as below.
> 
> unreferenced object 0xffff8800dab6d8d8 (size 96):
>   comm "swapper/0", pid 1, jiffies 4294877598 (age 38.483s)
>   hex dump (first 32 bytes):
>     00 00 00 00 00 01 00 00 08 00 00 00 10 00 00 00  ................
>     07 00 00 00 00 00 00 00 01 00 00 00 00 00 00 00  ................
>   backtrace:
>     [<ffffffff814e8f2e>] kmemleak_alloc+0x4e/0xb0
>     [<ffffffff811a0600>] __kmalloc+0x280/0x320
>     [<ffffffff81309b61>] soft_cursor+0x231/0x290
>     [<ffffffff81309393>] bit_cursor+0x613/0x650
>     [<ffffffff8130556b>] fbcon_cursor+0x13b/0x1c0
>     [<ffffffff813755f8>] hide_cursor+0x28/0xa0
>     [<ffffffff81376e98>] redraw_screen+0x168/0x240
>     [<ffffffff81303891>] fbcon_prepare_logo+0x381/0x420
>     [<ffffffff81303c7e>] fbcon_init+0x34e/0x590
>     [<ffffffff81375828>] visual_init+0xb8/0x120
>     [<ffffffff81377c93>] do_bind_con_driver+0x163/0x380
>     [<ffffffff81378494>] do_take_over_console+0x114/0x1c0
>     [<ffffffff81303f23>] do_fbcon_takeover+0x63/0xd0
>     [<ffffffff813086dd>] fbcon_event_notify+0x68d/0x7e0
>     [<ffffffff814ff7ac>] notifier_call_chain+0x4c/0x70
>     [<ffffffff8108c85d>] __blocking_notifier_call_chain+0x4d/0x70
> 
> This memory leak cause is, fbcon_ops's cursor_src is allocated in
> soft_cursor() but not released in con2fb_release_oldinfo().
> so, cursor_src is needed to be released when oldinfo is going to be
> released.
> 
> Signed-off-by: Masami Ichikawa <masami256@...il.com>
> ---
>  drivers/video/console/fbcon.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/drivers/video/console/fbcon.c b/drivers/video/console/fbcon.c
> index f447734..57b1d44 100644
> --- a/drivers/video/console/fbcon.c
> +++ b/drivers/video/console/fbcon.c
> @@ -748,6 +748,7 @@ static int con2fb_release_oldinfo(struct vc_data *vc, struct fb_info *oldinfo,
>  		fbcon_del_cursor_timer(oldinfo);
>  		kfree(ops->cursor_state.mask);
>  		kfree(ops->cursor_data);
> +		kfree(ops->cursor_src);
>  		kfree(ops->fontbuffer);
>  		kfree(oldinfo->fbcon_par);
>  		oldinfo->fbcon_par = NULL;
> 

Thanks, queued for 3.16.

 Tomi



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