From: SeongJae Park <sj@kernel.org>
Date: Mon, 6 Nov 2023 23:34:08 +0000 (+0000)
Subject: mm/damon/sysfs-schemes: handle tried region directory allocation failure
X-Git-Tag: v6.6.17~2759
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=0bf5055d5d33133c3a7cc5e4032eeb0ba7832c44;p=platform%2Fkernel%2Flinux-rpi.git

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

commit ae636ae2bbfd9279f5681dbf320d1da817e52b68 upstream.

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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---

diff --git a/mm/damon/sysfs-schemes.c b/mm/damon/sysfs-schemes.c
index 527e7d1..13e29fe 100644
--- a/mm/damon/sysfs-schemes.c
+++ b/mm/damon/sysfs-schemes.c
@@ -1752,6 +1752,8 @@ static int damon_sysfs_before_damos_apply(struct damon_ctx *ctx,
 		return 0;
 
 	region = damon_sysfs_scheme_region_alloc(r);
+	if (!region)
+		return 0;
 	list_add_tail(&region->list, &sysfs_regions->regions_list);
 	sysfs_regions->nr_regions++;
 	if (kobject_init_and_add(&region->kobj,