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| author | Chengfeng Ye <cyeaa@connect.ust.hk> | 2021-10-24 13:17:36 +0200 |
|---|---|---|
| committer | Takashi Iwai <tiwai@suse.de> | 2021-10-26 08:05:23 +0200 |
| commit | b97053df0f04747c3c1e021ecbe99db675342954 (patch) | |
| tree | dc5a4a5a4562a0c2bf896596860b10945fdba7c6 /sound/usb/clock.c | |
| parent | ALSA: gus: fix null pointer dereference on pointer block (diff) | |
| download | linux-b97053df0f04747c3c1e021ecbe99db675342954.tar.xz linux-b97053df0f04747c3c1e021ecbe99db675342954.zip | |
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>
Diffstat (limited to 'sound/usb/clock.c')
| -rw-r--r-- | sound/usb/clock.c | 4 |
1 files changed, 4 insertions, 0 deletions
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 |