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| author | SeongJae Park <sj@kernel.org> | 2023-11-06 23:34:08 +0000 |
|---|---|---|
| committer | Andrew Morton <akpm@linux-foundation.org> | 2023-11-15 15:30:09 -0800 |
| commit | ae636ae2bbfd9279f5681dbf320d1da817e52b68 (patch) | |
| tree | 586aef3dce0fbf5ce96c5b1a2e557bf3df939c87 /mm | |
| parent | 84055688b6bc075c92a88e2d6c3ad26ab93919f9 (diff) | |
| download | linux-ae636ae2bbfd9279f5681dbf320d1da817e52b68.tar.gz linux-ae636ae2bbfd9279f5681dbf320d1da817e52b68.tar.bz2 linux-ae636ae2bbfd9279f5681dbf320d1da817e52b68.zip | |
mm/damon/sysfs-schemes: handle tried region directory allocation failure
DAMON sysfs interface's before_damos_apply callback
(damon_sysfs_before_damos_apply()), which creates the DAMOS tried regions
for each DAMOS action applied region, is not handling the allocation
failure for the sysfs directory data. As a result, NULL pointer
derefeence is possible. Fix it by handling the case.
Link: https://lkml.kernel.org/r/20231106233408.51159-4-sj@kernel.org
Fixes: f1d13cacabe1 ("mm/damon/sysfs: implement DAMOS tried regions update command")
Signed-off-by: SeongJae Park <sj@kernel.org>
Cc: <stable@vger.kernel.org> [6.2+]
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'mm')
| -rw-r--r-- | mm/damon/sysfs-schemes.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/mm/damon/sysfs-schemes.c b/mm/damon/sysfs-schemes.c index 7413cb35c5a9..be667236b8e6 100644 --- a/mm/damon/sysfs-schemes.c +++ b/mm/damon/sysfs-schemes.c @@ -1826,6 +1826,8 @@ static int damon_sysfs_before_damos_apply(struct damon_ctx *ctx, return 0; region = damon_sysfs_scheme_region_alloc(r); + if (!region) + return 0; list_add_tail(®ion->list, &sysfs_regions->regions_list); sysfs_regions->nr_regions++; if (kobject_init_and_add(®ion->kobj, |