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authorSeongJae Park <sj@kernel.org>2023-11-06 23:34:08 +0000
committerAndrew Morton <akpm@linux-foundation.org>2023-11-15 15:30:09 -0800
commitae636ae2bbfd9279f5681dbf320d1da817e52b68 (patch)
tree586aef3dce0fbf5ce96c5b1a2e557bf3df939c87
parent84055688b6bc075c92a88e2d6c3ad26ab93919f9 (diff)
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>
-rw-r--r--mm/damon/sysfs-schemes.c2
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(&region->list, &sysfs_regions->regions_list);
sysfs_regions->nr_regions++;
if (kobject_init_and_add(&region->kobj,