提交 2127c01b 编写于 作者: J Jia-Ju Bai 提交者: Takashi Iwai

ALSA: i2c: ak4xxx-adda: Fix a possible null pointer dereference in build_adc_controls()

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: NJia-Ju Bai <baijiaju1990@gmail.com>
Signed-off-by: NTakashi Iwai <tiwai@suse.de>
上级 dd65f7e1
无相关合并请求
......@@ -775,11 +775,12 @@ 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;
......
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