* + mm-damon-sysfs-schemes-handle-tried-region-directory-allocation-failure.patch added to mm-hotfixes-unstable branch
@ 2023-11-07 15:41 Andrew Morton
0 siblings, 0 replies; only message in thread
From: Andrew Morton @ 2023-11-07 15:41 UTC (permalink / raw)
To: mm-commits, stable, sj, akpm
The patch titled
Subject: mm/damon/sysfs-schemes: handle tried region directory allocation failure
has been added to the -mm mm-hotfixes-unstable branch. Its filename is
mm-damon-sysfs-schemes-handle-tried-region-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-region-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@kernel.org>
Subject: mm/damon/sysfs-schemes: handle tried region directory allocation failure
Date: Mon, 6 Nov 2023 23:34:08 +0000
DAMON sysfs interface's before_damos_apply callback
(damon_sysfs_before_damos_apply()), which creates the DAMOS tried regions
for each DAMOS action applied region, is not handling the allocation
failure for the sysfs directory data. As a result, NULL pointer
derefeence is possible. Fix it by handling the case.
Link: https://lkml.kernel.org/r/20231106233408.51159-4-sj@kernel.org
Fixes: f1d13cacabe1 ("mm/damon/sysfs: implement DAMOS tried regions update command")
Signed-off-by: SeongJae Park <sj@kernel.org>
Cc: <stable@vger.kernel.org> [6.2+]
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---
mm/damon/sysfs-schemes.c | 2 ++
1 file changed, 2 insertions(+)
--- a/mm/damon/sysfs-schemes.c~mm-damon-sysfs-schemes-handle-tried-region-directory-allocation-failure
+++ a/mm/damon/sysfs-schemes.c
@@ -1826,6 +1826,8 @@ static int damon_sysfs_before_damos_appl
return 0;
region = damon_sysfs_scheme_region_alloc(r);
+ if (!region)
+ return 0;
list_add_tail(®ion->list, &sysfs_regions->regions_list);
sysfs_regions->nr_regions++;
if (kobject_init_and_add(®ion->kobj,
_
Patches currently in -mm which might be from sj@kernel.org 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
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