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ALSA: usb-audio: fix null pointer dereference on pointer cs_desc 

The pointer cs_desc return from snd_usb_find_clock_source could
be null, so there is a potential null pointer dereference issue.
Fix this by adding a null check before dereference.

Signed-off-by: Chengfeng Ye <cyeaa@connect.ust.hk>
Link: https://lore.kernel.org/r/20211024111736.11342-1-cyeaa@connect.ust.hk
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Chengfeng Ye 2021-10-24 04:17:36 -07:00 committed by Takashi Iwai
parent a0d21bb327
commit b97053df0f
1 changed files with 4 additions and 0 deletions
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4
sound/usb/clock.c
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@ -496,6 +496,10 @@ int snd_usb_set_sample_rate_v2v3(struct snd_usb_audio *chip,
union uac23_clock_source_desc *cs_desc;
cs_desc = snd_usb_find_clock_source(chip, clock, fmt->protocol);
if (!cs_desc)
return 0;
if (fmt->protocol == UAC_VERSION_3)
bmControls = le32_to_cpu(cs_desc->v3.bmControls);
else