lkml.org 
[lkml]   [2023]   [Nov]   [6]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH 3/3] mm/damon/sysfs-schemes: handle tried region directory allocation failure
Date
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.

Fixes: f1d13cacabe1 ("mm/damon/sysfs: implement DAMOS tried regions update command")
Cc: <stable@vger.kernel.org> # 6.2.x
Signed-off-by: SeongJae Park <sj@kernel.org>
---
mm/damon/sysfs-schemes.c | 2 ++
1 file changed, 2 insertions(+)

diff --git a/mm/damon/sysfs-schemes.c b/mm/damon/sysfs-schemes.c
index 7413cb35c5a9..be667236b8e6 100644
--- a/mm/damon/sysfs-schemes.c
+++ b/mm/damon/sysfs-schemes.c
@@ -1826,6 +1826,8 @@ 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,
--
2.34.1
\
 
 \ /
  Last update: 2023-11-20 13:50    [W:0.037 / U:1.204 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site