Commit b97053df authored by Chengfeng Ye's avatar Chengfeng Ye Committed by Takashi Iwai
Browse files

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: default avatarChengfeng Ye <cyeaa@connect.ust.hk>
Link: https://lore.kernel.org/r/20211024111736.11342-1-cyeaa@connect.ust.hk


Signed-off-by: default avatarTakashi Iwai <tiwai@suse.de>
parent a0d21bb3

sound/usb/clock.c

+4 −0
Original line number Diff line number Diff line
@@ -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