From 84055688b6bc075c92a88e2d6c3ad26ab93919f9 Mon Sep 17 00:00:00 2001 From: SeongJae Park Date: Mon, 6 Nov 2023 23:34:07 +0000 Subject: 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: 9277d0367ba1 ("mm/damon/sysfs-schemes: implement scheme region directory") Signed-off-by: SeongJae Park Cc: [6.2+] Signed-off-by: Andrew Morton --- mm/damon/sysfs-schemes.c | 3 +++ 1 file changed, 3 insertions(+) (limited to 'mm') 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(®ions->regions_list); regions->nr_regions = 0; -- cgit