Description: bpf: Defer the free of inner map when necessary
References:
Notes:
 carnil> Introduced in bba1dc0b55ac ("bpf: Remove redundant synchronize_rcu.")
 carnil> 638e4b825d52 ("bpf: Allows per-cpu maps and map-in-map in sleepable programs").
 carnil> Vulnerable versions: 5.9-rc1 5.12-rc1.
Bugs:
upstream: released (6.8-rc1) [876673364161da50eed6b472d746ef88242b2368]
6.7-upstream-stable: released (6.7.2) [bfd9b20c4862f41d4590fde11d70a5eeae53dcc5]
6.6-upstream-stable: released (6.6.14) [f91cd728b10c51f6d4a39957ccd56d1e802fc8ee]
6.1-upstream-stable: released (6.1.75) [62fca83303d608ad4fec3f7428c8685680bb01b0]
5.10-upstream-stable: released (5.10.214) [90c445799fd1dc214d7c6279c144e33a35e29ef2]
4.19-upstream-stable: N/A "Vulnerable code not present"
sid: released (6.6.15-1)
6.1-bookworm-security: released (6.1.76-1)
5.10-bullseye-security: needed
4.19-buster-security: N/A "Vulnerable code not present"