[PATCH 0/1 v3][focal:linux-oem-5.6, focal:linux-oem-5.10, groovy:linux] CVE-2021-29646: tipc data size check

[Tim Gardner]

v2 - Include groovy:linux
v3 - include CVE-2021-29646 in patch

This patch is already in Hirsute:linux

Introduced by e1f32190cf7ddd55778b460e7d44af3f76529698 v5.5
Fixed by 0217ed2848e8538bcf9172d97ed2eeb4a26041bb v5.12

[SRU Justification]

An issue was discovered in the Linux kernel before 5.11.11. tipc_nl_retrieve_key
in net/tipc/node.c does not properly validate certain data sizes, aka
CID-0217ed2848e8.

[Test Plan]
None. Caught by Syzbot fuzzing.

[Where problems could occur]
User input could be erroneously rejected.

[Other Info]
Released in stable kernels:
linux-5.10.y
linux-5.11.y