The patch titled
Subject: mm/damon/sysfs-schemes: handle tried regions sysfs directory allocation failure
has been added to the -mm mm-hotfixes-unstable branch. Its filename is
mm-damon-sysfs-schemes-handle-tried-regions-sysfs-directory-allocation-failure.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-damon-sysfs-schemes-handle-tried-regions-sysfs-directory-allocation-failure.patch
This patch will later appear in the mm-hotfixes-unstable branch at
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
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------------------------------------------------------
From: SeongJae Park <sj@xxxxxxxxxx>
Subject: mm/damon/sysfs-schemes: handle tried regions sysfs directory allocation failure
Date: Mon, 6 Nov 2023 23:34:07 +0000
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@xxxxxxxxxx
Fixes: 9277d0367ba1 ("mm/damon/sysfs-schemes: implement scheme region directory")
Signed-off-by: SeongJae Park <sj@xxxxxxxxxx>
Cc: <stable@xxxxxxxxxxxxxxx> [6.2+]
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/damon/sysfs-schemes.c | 3 +++
1 file changed, 3 insertions(+)
--- a/mm/damon/sysfs-schemes.c~mm-damon-sysfs-schemes-handle-tried-regions-sysfs-directory-allocation-failure
+++ a/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;
_
Patches currently in -mm which might be from sj@xxxxxxxxxx are
mm-damon-sysfs-check-error-from-damon_sysfs_update_target.patch
mm-damon-sysfs-schemes-handle-tried-regions-sysfs-directory-allocation-failure.patch
mm-damon-sysfs-schemes-handle-tried-region-directory-allocation-failure.patch
