Description: tee: handle lookup of shm with reference count 0
References:
 https://bugzilla.redhat.com/show_bug.cgi?id=2030747
 https://lore.kernel.org/lkml/20211214123540.1789434-1-jens.wiklander@linaro.org/
Notes:
Bugs:
upstream: released (5.16-rc7) [dfd0743f1d9ea76931510ed150334d571fbab49d]
5.10-upstream-stable: released (5.10.89) [c05d8f66ec3470e5212c4d08c46d6cb5738d600d]
4.19-upstream-stable: released (4.19.224) [b4a661b4212b8fac8853ec3b68e4a909dccc88a1]
4.9-upstream-stable: N/A "Vulnerable code not present"
sid: released (5.15.15-1)
5.10-bullseye-security: released (5.10.92-1)
4.19-buster-security: released (4.19.232-1)
4.9-stretch-security: N/A "Vulnerable code not present"