This is a note to let you know that I've just added the patch titled
mm/damon/sysfs: check error from damon_sysfs_update_target()
to the 6.1-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
mm-damon-sysfs-check-error-from-damon_sysfs_update_target.patch
and it can be found in the queue-6.1 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From b4936b544b08ed44949055b92bd25f77759ebafc Mon Sep 17 00:00:00 2001
From: SeongJae Park <sj@xxxxxxxxxx>
Date: Mon, 6 Nov 2023 23:34:06 +0000
Subject: mm/damon/sysfs: check error from damon_sysfs_update_target()
From: SeongJae Park <sj@xxxxxxxxxx>
commit b4936b544b08ed44949055b92bd25f77759ebafc upstream.
Patch series "mm/damon/sysfs: fix unhandled return values".
Some of DAMON sysfs interface code is not handling return values from some
functions. As a result, confusing user input handling or NULL-dereference
is possible. Check those properly.
This patch (of 3):
damon_sysfs_update_target() returns error code for failures, but its
caller, damon_sysfs_set_targets() is ignoring that. The update function
seems making no critical change in case of such failures, but the behavior
will look like DAMON sysfs is silently ignoring or only partially
accepting the user input. Fix it.
Link: https://lkml.kernel.org/r/20231106233408.51159-1-sj@xxxxxxxxxx
Link: https://lkml.kernel.org/r/20231106233408.51159-2-sj@xxxxxxxxxx
Fixes: 19467a950b49 ("mm/damon/sysfs: remove requested targets when online-commit inputs")
Signed-off-by: SeongJae Park <sj@xxxxxxxxxx>
Cc: <stable@xxxxxxxxxxxxxxx> [5.19+]
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
mm/damon/sysfs.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
--- a/mm/damon/sysfs.c
+++ b/mm/damon/sysfs.c
@@ -2241,8 +2241,10 @@ static int damon_sysfs_set_targets(struc
damon_for_each_target_safe(t, next, ctx) {
if (i < sysfs_targets->nr) {
- damon_sysfs_update_target(t, ctx,
+ err = damon_sysfs_update_target(t, ctx,
sysfs_targets->targets_arr[i]);
+ if (err)
+ return err;
} else {
if (damon_target_has_pid(ctx))
put_pid(t->pid);
Patches currently in stable-queue which might be from sj@xxxxxxxxxx are
queue-6.1/mm-damon-implement-a-function-for-max-nr_accesses-safe-calculation.patch
queue-6.1/mm-damon-ops-common-avoid-divide-by-zero-during-region-hotness-calculation.patch
queue-6.1/mm-damon-sysfs-check-error-from-damon_sysfs_update_target.patch
queue-6.1/mm-damon-lru_sort-avoid-divide-by-zero-in-hot-threshold-calculation.patch
queue-6.1/mm-damon-sysfs-update-monitoring-target-regions-for-online-input-commit.patch
queue-6.1/mm-damon-sysfs-remove-requested-targets-when-online-commit-inputs.patch
