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@vger.kernel.org.

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@gmail.com 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@kernel.org Fixes: a61ea561c871 ("mm/damon/sysfs: link DAMON for virtual address spaces monitoring") Signed-off-by: Levi Yun ppbuk5246@gmail.com Signed-off-by: SeongJae Park sj@kernel.org Reviewed-by: SeongJae Park sj@kernel.org Cc: stable@vger.kernel.org [5.17.x] Signed-off-by: Andrew Morton akpm@linux-foundation.org

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;