The patch below does not apply to the 5.19-stable tree.
If someone wants it applied there, or to any other stable or longterm
tree, then please email the backport, including the original git commit
id to <stable@xxxxxxxxxxxxxxx>.
Possible dependencies:
1c8e2349f2d0 ("damon/sysfs: fix possible memleak on damon_sysfs_add_target")
c9e124e0382d ("mm/damon/{dbgfs,sysfs}: move target_has_pid() from dbgfs to damon.h")
thanks,
greg k-h
------------------ original commit in Linus's tree ------------------
>From 1c8e2349f2d033f634d046063b704b2ca6c46972 Mon Sep 17 00:00:00 2001
From: Levi Yun <ppbuk5246@xxxxxxxxx>
Date: Mon, 26 Sep 2022 16:06:11 +0000
Subject: [PATCH] damon/sysfs: fix possible memleak on damon_sysfs_add_target
When damon_sysfs_add_target couldn't find proper task, New allocated
damon_target structure isn't registered yet, So, it's impossible to free
new allocated one by damon_sysfs_destroy_targets.
By calling damon_add_target as soon as allocating new target, Fix this
possible memory leak.
Link: https://lkml.kernel.org/r/20220926160611.48536-1-sj@xxxxxxxxxx
Fixes: a61ea561c871 ("mm/damon/sysfs: link DAMON for virtual address spaces monitoring")
Signed-off-by: Levi Yun <ppbuk5246@xxxxxxxxx>
Signed-off-by: SeongJae Park <sj@xxxxxxxxxx>
Reviewed-by: SeongJae Park <sj@xxxxxxxxxx>
Cc: <stable@xxxxxxxxxxxxxxx> [5.17.x]
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
diff --git a/mm/damon/sysfs.c b/mm/damon/sysfs.c
index 7488e27c87c3..bdef9682d0a0 100644
--- a/mm/damon/sysfs.c
+++ b/mm/damon/sysfs.c
@@ -2182,12 +2182,12 @@ static int damon_sysfs_add_target(struct damon_sysfs_target *sys_target,
if (!t)
return -ENOMEM;
+ damon_add_target(ctx, t);
if (damon_target_has_pid(ctx)) {
t->pid = find_get_pid(sys_target->pid);
if (!t->pid)
goto destroy_targets_out;
}
- damon_add_target(ctx, t);
err = damon_sysfs_set_regions(t, sys_target->regions);
if (err)
goto destroy_targets_out;
