This series fixes three bugs in the sysctl write-buffer replacement path
of __cgroup_bpf_run_filter_sysctl(). It resolves a kvzalloc()/kfree()
mismatch, adds a missing NUL terminator to the replacement string, and
updates a stale return value check to safely restore the replacement
functionality.

Patch Summary:
- patch 1 NUL-terminates the replaced sysctl value
- patch 2 uses kvfree() for the replaced sysctl write buffer
- patch 3 restores sysctl new-value replacement

Changelog:
v2 -> v3:
- reordered patches 1 and 2
- added the missing Reviewed-by/Acked-by tags to patches 2 and 3
- fixed the incorrect Fixes tag in patch 3
- simplified the dynamic test logs in patch 1 and 2, and updated
  titles

Dawei Feng (3):
  bpf: NUL-terminate replaced sysctl value
  bpf: use kvfree() for replaced sysctl write buffer
  bpf: Restore sysctl new-value from 1 to 0

 kernel/bpf/cgroup.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

-- 
2.34.1