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authorSeongJae Park <sj@kernel.org>2023-11-06 23:34:07 +0000
committerAndrew Morton <akpm@linux-foundation.org>2023-11-15 15:30:09 -0800
commit84055688b6bc075c92a88e2d6c3ad26ab93919f9 (patch)
tree445c74fa0ee16c9d64f220cdc43b288d7b84c8fa
parentb4936b544b08ed44949055b92bd25f77759ebafc (diff)
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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 <sj@kernel.org> Cc: <stable@vger.kernel.org> [6.2+] Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
-rw-r--r--mm/damon/sysfs-schemes.c3
1 files changed, 3 insertions, 0 deletions
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;