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ASoC: cs35l41: check cspl cmd input value

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fix the below panic caused by google security test

<6>[   50.569557,4] [<ffffff800f8020cc>] cs35l41_cspl_cmd_put+0x3c/0x50 [cirrus_cs35l41]
<6>[   50.569571,4] [<ffffff8013dc43d4>] snd_ctl_elem_write+0x160/0x1c0
<6>[   50.569584,4] [<ffffff8013dc5b64>] snd_ctl_ioctl+0x114/0xa78
<6>[   50.569600,4] [<ffffff8013278b9c>] do_vfs_ioctl+0xd0/0xdb4
<6>[   50.569613,4] [<ffffff8013279910>] SyS_ioctl+0x90/0xa4
<6>[   50.569628,4] [<ffffff8013084380>] el0_svc_naked+0x34/0x38
<0>[   50.569644,4] Code: b9404823 f9400c81 f9400c42 f9405c21 (b8635842)

Change-Id: Ia69a5a6a8df1d47ad1e00559bbcc8Montana2cba47eb
Signed-off-by: huangys <huangys@motorola.com>
Reviewed-on: https://gerrit.mot.com/1246646
SLTApproved: Slta Waiver
SME-Granted: SME Approvals Granted
Tested-by: Jira Key
Reviewed-by: Guobin Zhang <zhanggb@motorola.com>
Submit-Approved: Jira Key
This commit is contained in:
huangys 2018-09-26 16:17:54 +08:00 • committed by Yuesheng Huang
commit 490ffc29b2
1 changed files with 3 additions and 0 deletions
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3
sound/soc/codecs/cs35l41.c
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@ -319,6 +319,9 @@ static int cs35l41_cspl_cmd_put(struct snd_kcontrol *kcontrol,
unsigned int i = ucontrol->value.enumerated.item[0];
int ret = 0;
if (i <0 || i >= sizeof(cs35l41_cspl_cmd_val)/sizeof(cs35l41_cspl_cmd_val[0]))
return -EINVAL;
soc_enum = (struct soc_enum *)kcontrol->private_value;
cs35l41->cspl_cmd = soc_enum->values[i];