linux-kernel - [PATCH 3.2 074/149] ASoC: 88pm860x: array overflow in snd_soc_put_volsw_2r

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Date:	Mon, 21 Oct 2013 09:46:28 +0100
From:	Ben Hutchings <ben@...adent.org.uk>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:	akpm@...ux-foundation.org,
	"Dan Carpenter" <dan.carpenter@...cle.com>,
	"Mark Brown" <broonie@...aro.org>
Subject: [PATCH 3.2 074/149] ASoC: 88pm860x: array overflow in
 snd_soc_put_volsw_2r_st()

3.2.52-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Dan Carpenter <dan.carpenter@...cle.com>

commit d967967e8d1116fb38bad25e58714b5dddd03cca upstream.

This is called from snd_ctl_elem_write() with user supplied data so we
need to add some bounds checking.

Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>
Signed-off-by: Mark Brown <broonie@...aro.org>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 sound/soc/codecs/88pm860x-codec.c | 3 +++
 1 file changed, 3 insertions(+)

--- a/sound/soc/codecs/88pm860x-codec.c
+++ b/sound/soc/codecs/88pm860x-codec.c
@@ -351,6 +351,9 @@ static int snd_soc_put_volsw_2r_st(struc
 	val = ucontrol->value.integer.value[0];
 	val2 = ucontrol->value.integer.value[1];
 
+	if (val >= ARRAY_SIZE(st_table) || val2 >= ARRAY_SIZE(st_table))
+		return -EINVAL;
+
 	err = snd_soc_update_bits(codec, reg, 0x3f, st_table[val].m);
 	if (err < 0)
 		return err;

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