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ASoC: cs35l41: Add out of bound check for mixer

Browse source 
Program such as nanomix allows out of bound input
to mixer, which may crash kernel.

This issue is found by Google test (LENOVO-848).

Add out of bound check for mixer to prevent
kernel crash.

Mot-Crs-fixed:(CR)

Change-Id: I4c0437cfd2d2570a9c9489db500cffc513f27c43
Signed-off-by: Li Xu <li.xu@cirrus.com>
Reviewed-on: https://gerrit.mot.com/1253050
SME-Granted: SME Approvals Granted
SLTApproved: Slta Waiver
Tested-by: Jira Key
Reviewed-by: Guobin Zhang <zhanggb@motorola.com>
Submit-Approved: Jira Key
Reviewed-on: https://gerrit.mot.com/1253083
This commit is contained in:
Li Xu 2018-09-26 11:04:40 -05:00 • committed by Yuesheng Huang
commit ae431b8af0
1 changed files with 7 additions and 2 deletions
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9
sound/soc/codecs/cs35l41.c
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@ -317,12 +317,17 @@ static int cs35l41_cspl_cmd_put(struct snd_kcontrol *kcontrol,
struct cs35l41_private *cs35l41 = snd_soc_codec_get_drvdata(codec);
struct soc_enum *soc_enum;
unsigned int i = ucontrol->value.enumerated.item[0];
int ret = 0;
soc_enum = (struct soc_enum *)kcontrol->private_value;
if (i >= soc_enum->items) {
dev_err(codec->dev, "Invalid mixer input (%u)\n", i);
return -EINVAL;
}
cs35l41->cspl_cmd = soc_enum->values[i];
return ret;
return 0;
}
static int cs35l41_cspl_cmd_get(struct snd_kcontrol *kcontrol,