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| author | Jia-Ju Bai <baijiaju1990@gmail.com> | 2019-07-26 10:14:42 +0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-10-05 13:09:37 +0200 |
| commit | 55a98e872186ea6e92a604c1b5e0ff75909237eb (patch) | |
| tree | b3c5f560204e8919c1615630017b0858e45caccb | |
| parent | 1af6822f29d6b5c3b6e832aba8ae5e312047665d (diff) | |
| download | linux-stable-55a98e872186ea6e92a604c1b5e0ff75909237eb.tar.gz linux-stable-55a98e872186ea6e92a604c1b5e0ff75909237eb.tar.bz2 linux-stable-55a98e872186ea6e92a604c1b5e0ff75909237eb.zip | |
ALSA: i2c: ak4xxx-adda: Fix a possible null pointer dereference in build_adc_controls()
[ Upstream commit 2127c01b7f63b06a21559f56a8c81a3c6535bd1a ]
In build_adc_controls(), there is an if statement on line 773 to check
whether ak->adc_info is NULL:
if (! ak->adc_info ||
! ak->adc_info[mixer_ch].switch_name)
When ak->adc_info is NULL, it is used on line 792:
knew.name = ak->adc_info[mixer_ch].selector_name;
Thus, a possible null-pointer dereference may occur.
To fix this bug, referring to lines 773 and 774, ak->adc_info
and ak->adc_info[mixer_ch].selector_name are checked before being used.
This bug is found by a static analysis tool STCheck written by us.
Signed-off-by: Jia-Ju Bai <baijiaju1990@gmail.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Sasha Levin <sashal@kernel.org>
| -rw-r--r-- | sound/i2c/other/ak4xxx-adda.c | 7 |
1 files changed, 4 insertions, 3 deletions
diff --git a/sound/i2c/other/ak4xxx-adda.c b/sound/i2c/other/ak4xxx-adda.c index 7f2761a2e7c8..971197c34fce 100644 --- a/sound/i2c/other/ak4xxx-adda.c +++ b/sound/i2c/other/ak4xxx-adda.c @@ -789,11 +789,12 @@ static int build_adc_controls(struct snd_akm4xxx *ak) return err; memset(&knew, 0, sizeof(knew)); - knew.name = ak->adc_info[mixer_ch].selector_name; - if (!knew.name) { + if (!ak->adc_info || + !ak->adc_info[mixer_ch].selector_name) { knew.name = "Capture Channel"; knew.index = mixer_ch + ak->idx_offset * 2; - } + } else + knew.name = ak->adc_info[mixer_ch].selector_name; knew.iface = SNDRV_CTL_ELEM_IFACE_MIXER; knew.info = ak4xxx_capture_source_info; |