Some of DAMON sysfs interface code is not handling return values from some functions. As a result, confusing user input handling or NULL-dereference is possible. Check those properly. Please note that these patches are not cleanly applicable on mm-unstable since mm-unstable has dropped the mainline-merged patches and rebased on v6.6, while some DAMON patches that these patches are depend on are merged in the mainline after v6.6. I confirmed these patches can cleanly applied on latest mainline, or mm-stable-2023-11-01-14-33. SeongJae Park (3): mm/damon/sysfs: check error from damon_sysfs_update_target() mm/damon/sysfs-schemes: handle tried regions sysfs directory allocation failure mm/damon/sysfs-schemes: handle tried region directory allocation failure mm/damon/sysfs-schemes.c | 5 +++++ mm/damon/sysfs.c | 4 +++- 2 files changed, 8 insertions(+), 1 deletion(-) base-commit: 3496e8e0a1eeabb738105c09e575495fa78914bb -- 2.34.1