Commit 84055688 authored by SeongJae Park's avatar SeongJae Park Committed by Andrew Morton
Browse files

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.

Link: https://lkml.kernel.org/r/20231106233408.51159-3-sj@kernel.org


Fixes: 9277d036 ("mm/damon/sysfs-schemes: implement scheme region directory")
Signed-off-by: default avatarSeongJae Park <sj@kernel.org>
Cc: <stable@vger.kernel.org>	[6.2+]
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
parent b4936b54

mm/damon/sysfs-schemes.c

+3 −0
Original line number Diff line number Diff line
@@ -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;