Messages in this thread Patch in this message | | | From | Sasha Levin <> | Subject | [PATCH AUTOSEL 5.14 71/75] ALSA: usb-audio: fix null pointer dereference on pointer cs_desc | Date | Tue, 9 Nov 2021 17:19:01 -0500 |
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From: Chengfeng Ye <cyeaa@connect.ust.hk>
[ Upstream commit b97053df0f04747c3c1e021ecbe99db675342954 ]
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> Signed-off-by: Sasha Levin <sashal@kernel.org> --- sound/usb/clock.c | 4 ++++ 1 file changed, 4 insertions(+)
diff --git a/sound/usb/clock.c b/sound/usb/clock.c index 14456f61539e1..6c3f3312113f6 100644 --- a/sound/usb/clock.c +++ b/sound/usb/clock.c @@ -499,6 +499,10 @@ 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 -- 2.33.0
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