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v7.0-rc7
linux/mm/damon
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Josh Law 6557004a8b mm/damon/sysfs: check contexts->nr in repeat_call_fn 
damon_sysfs_repeat_call_fn() calls damon_sysfs_upd_tuned_intervals(),
damon_sysfs_upd_schemes_stats(), and
damon_sysfs_upd_schemes_effective_quotas() without checking contexts->nr. 
If nr_contexts is set to 0 via sysfs while DAMON is running, these
functions dereference contexts_arr[0] and cause a NULL pointer
dereference.  Add the missing check.

For example, the issue can be reproduced using DAMON sysfs interface and
DAMON user-space tool (damo) [1] like below.

    $ sudo damo start --refresh_interval 1s
    $ echo 0 | sudo tee \
            /sys/kernel/mm/damon/admin/kdamonds/0/contexts/nr_contexts

Link: https://patch.msgid.link/20260320163559.178101-3-objecting@objecting.org
Link: https://lkml.kernel.org/r/20260321175427.86000-4-sj@kernel.org
Link: https://github.com/damonitor/damo [1]
Fixes: d809a7c64b ("mm/damon/sysfs: implement refresh_ms file internal work")
Signed-off-by: Josh Law <objecting@objecting.org>
Reviewed-by: SeongJae Park <sj@kernel.org>
Signed-off-by: SeongJae Park <sj@kernel.org>
Cc: <stable@vger.kernel.org>	[6.17+]
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
2026-03-27 20:48:38 -07:00
..
tests Convert remaining multi-line kmalloc_obj/flex GFP_KERNEL uses 2026-02-22 08:26:33 -08:00
core.c mm/damon/core: avoid use of half-online-committed context 2026-03-21 17:36:33 -07:00
Kconfig mm/damon/Kconfig: make DAMON_STAT_ENABLED_DEFAULT depend on DAMON_STAT 2025-09-13 16:55:07 -07:00
lru_sort.c mm/damon: rename min_sz_region of damon_ctx to min_region_sz 2026-01-31 14:22:47 -08:00
Makefile mm/damon: introduce DAMON_STAT module 2025-07-09 22:41:55 -07:00
modules-common.c mm/damon: s/primitives/code/ on comments 2025-06-05 21:55:41 -07:00
modules-common.h mm/damon: s/primitives/code/ on comments 2025-06-05 21:55:41 -07:00
ops-common.c memcg: rename mem_cgroup_ino() to mem_cgroup_id() 2026-01-26 20:02:25 -08:00
ops-common.h mm/damon/paddr: move filters existence check function to ops-common 2025-09-13 16:54:47 -07:00
paddr.c mm/damon: remove damon_operations->cleanup() 2026-01-31 14:22:45 -08:00
reclaim.c mm/damon: rename min_sz_region of damon_ctx to min_region_sz 2026-01-31 14:22:47 -08:00
stat.c mm/damon/stat: monitor all System RAM resources 2026-03-23 09:35:05 -07:00
sysfs-common.c Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
sysfs-common.h mm/damon: s/primitives/code/ on comments 2025-06-05 21:55:41 -07:00
sysfs-schemes.c Convert more 'alloc_obj' cases to default GFP_KERNEL arguments 2026-02-21 20:03:00 -08:00
sysfs.c mm/damon/sysfs: check contexts->nr in repeat_call_fn 2026-03-27 20:48:38 -07:00
vaddr.c Convert more 'alloc_obj' cases to default GFP_KERNEL arguments 2026-02-21 20:03:00 -08:00