Description: udmabuf: add back sanity check
References:
 https://www.zerodayinitiative.com/advisories/ZDI-23-441/
Notes:
 carnil> Commit fixes 7b26e4e2119d ("udmabuf: drop WARN_ON() check.") in
 carnil> 4.20-rc1.
Bugs:
upstream: released (5.19-rc4) [05b252cccb2e5c3f56119d25de684b4f810ba40a]
6.1-upstream-stable: N/A "Fixed before branching point"
5.10-upstream-stable: released (5.10.127) [20119c1e0fff89542ff3272ace87e04cf6ee6bea]
4.19-upstream-stable: N/A "Vulnerable code introduced later"
sid: released (5.18.14-1)
5.10-bullseye-security: released (5.10.127-1)
4.19-buster-security: N/A "Vulnerable code introduced later"