Patch "ASoC: rsnd: Add missing initialization of ADG req_rate" has been added to the 4.4-stable tree

Patch "ASoC: rsnd: Add missing initialization of ADG req_rate" has been added to the 4.4-stable tree

[gregkh]

This is a note to let you know that I've just added the patch titled

    ASoC: rsnd: Add missing initialization of ADG req_rate

to the 4.4-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     asoc-rsnd-add-missing-initialization-of-adg-req_rate.patch
and it can be found in the queue-4.4 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From 8b27418f300cafbdbbb8cfa9c29d398ed34d6723 Mon Sep 17 00:00:00 2001
From: Geert Uytterhoeven <geert+renesas@glider.be>
Date: Wed, 28 Oct 2015 16:03:48 +0100
Subject: ASoC: rsnd: Add missing initialization of ADG req_rate

From: Geert Uytterhoeven <geert+renesas@glider.be>

commit 8b27418f300cafbdbbb8cfa9c29d398ed34d6723 upstream.

If the "clock-frequency" DT property is not found, req_rate is used
uninitialized, and the "audio_clkout" clock will be created with an
arbitrary clock rate.

This uninitialized kernel stack data may leak to userspace through
/sys/kernel/debug/clk/clk_summary, cfr. the value in the "rate" column:

       clock     enable_cnt  prepare_cnt        rate   accuracy   phase
    --------------------------------------------------------------------
     audio_clkout         0            0  4001836240          0 0

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Acked-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Thong Ho <thong.ho.px@rvc.renesas.com>
Signed-off-by: Nhan Nguyen <nhan.nguyen.yb@renesas.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 sound/soc/sh/rcar/adg.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/sound/soc/sh/rcar/adg.c
+++ b/sound/soc/sh/rcar/adg.c
@@ -437,7 +437,7 @@ static void rsnd_adg_get_clkout(struct r
 	struct device *dev = rsnd_priv_to_dev(priv);
 	struct device_node *np = dev->of_node;
 	u32 ckr, rbgx, rbga, rbgb;
-	u32 rate, req_rate, div;
+	u32 rate, req_rate = 0, div;
 	uint32_t count = 0;
 	unsigned long req_48kHz_rate, req_441kHz_rate;
 	int i;


Patches currently in stable-queue which might be from geert+renesas@glider.be are

queue-4.4/asoc-rsnd-add-missing-initialization-of-adg-req_rate.patch