Description: drm/qxl: fix UAF on handle creation
References:
 https://www.zerodayinitiative.com/advisories/ZDI-CAN-20940/
Notes:
 bwh> Introduced in 4.15 by commit 62676d10b483 "qxl: alloc & use shadow for
 bwh> dumb buffers".
Bugs:
upstream: released (6.5-rc7) [c611589b4259ed63b9b77be6872b1ce07ec0ac16]
6.1-upstream-stable: released (6.1.47) [a1fa8f0fc58e0ec972f718030710efc442d7304b]
5.10-upstream-stable: released (5.10.208) [03585b18b715621a64ced023ca8c1fc36b6b2119]
4.19-upstream-stable: needed
sid: released (6.4.13-1)
6.1-bookworm-security: released (6.1.52-1)
5.10-bullseye-security: released (5.10.209-1)
4.19-buster-security: needed