CVE ID:	CVE-2021-47211
Description:	In the Linux kernel, the following vulnerability has been resolved: 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.
Test IDs:	None available
Cross References:	Common Vulnerability Exposure (CVE) ID: CVE-2021-47211 https://git.kernel.org/stable/c/58fa50de595f152900594c28ec9915c169643739 https://git.kernel.org/stable/c/58fa50de595f152900594c28ec9915c169643739 https://git.kernel.org/stable/c/b97053df0f04747c3c1e021ecbe99db675342954 https://git.kernel.org/stable/c/b97053df0f04747c3c1e021ecbe99db675342954