[PATCH 2/3] mm/damon/sysfs-schemes: handle tried regions sysfs directory allocation failure

DAMOS tried regions sysfs directory allocation function (damon_sysfs_scheme_regions_alloc()) is not handling the memory allocation failure. In the case, the code will dereference NULL pointer. Handle the failure to avoid such invalid access.

Fixes: 9277d0367ba1 ("mm/damon/sysfs-schemes: implement scheme region directory") Cc: stable@vger.kernel.org # 6.2.x Signed-off-by: SeongJae Park sj@kernel.org --- mm/damon/sysfs-schemes.c | 3 +++ 1 file changed, 3 insertions(+)

diff --git a/mm/damon/sysfs-schemes.c b/mm/damon/sysfs-schemes.c index 45bd0fd4a8b1..7413cb35c5a9 100644 --- a/mm/damon/sysfs-schemes.c +++ b/mm/damon/sysfs-schemes.c @@ -162,6 +162,9 @@ damon_sysfs_scheme_regions_alloc(void) struct damon_sysfs_scheme_regions *regions = kmalloc(sizeof(*regions), GFP_KERNEL);

+ if (!regions) + return NULL; + regions->kobj = (struct kobject){}; INIT_LIST_HEAD(&regions->regions_list); regions->nr_regions = 0;