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>

diff --git a/mm/damon/sysfs-schemes.c b/mm/damon/sysfs-schemes.c
index 7413cb35c5a9c43c5801215e760c62d4fcf3e68a..be667236b8e6e30713a205a4987d50c3b48ab463 100644 (file)
--- 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,