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UPSTREAM: mm/damon/sysfs-schemes: handle tried regions sysfs directory allocation failure

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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>

(cherry picked from commit 84055688b6bc075c92a88e2d6c3ad26ab93919f9)

Bug: 300502883
Change-Id: I86ecb2f3cf1604199b5567576b1fa583914f7f36
Signed-off-by: cui yangpei <cuiyangpei@xiaomi.com>
This commit is contained in:
SeongJae Park 2023-11-06 23:34:07 +00:00 • committed by Suren Baghdasaryan
parent 7fbeab3c65
commit 1cedfc05e9
1 changed files with 3 additions and 0 deletions
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3
mm/damon/sysfs-schemes.c
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@ -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;