From b97053df0f04747c3c1e021ecbe99db675342954 Mon Sep 17 00:00:00 2001 From: Chengfeng Ye Date: Sun, 24 Oct 2021 04:17:36 -0700 Subject: 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 Link: https://lore.kernel.org/r/20211024111736.11342-1-cyeaa@connect.ust.hk Signed-off-by: Takashi Iwai --- sound/usb/clock.c | 4 ++++ 1 file changed, 4 insertions(+) (limited to 'sound/usb') diff --git a/sound/usb/clock.c b/sound/usb/clock.c index 7dd71d342443..4dfe76416794 100644 --- a/sound/usb/clock.c +++ b/sound/usb/clock.c @@ -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 -- cgit