diff mbox series

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

Message ID 20231106233408.51159-3-sj@kernel.org (mailing list archive)
State New
Headers show
Series mm/damon/sysfs: fix unhandled return values | expand

Commit Message

SeongJae Park Nov. 6, 2023, 11:34 p.m. UTC 
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 mbox series

Patch

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;