linux-kernel - Please merge commit 85c2ceaafbd3 ("mm/damon/sysfs: eliminate potential uninitialized variable warning") into >=5.19 stable trees

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Date:   Fri,  8 Dec 2023 20:09:43 +0000
From:   SeongJae Park <sj@...nel.org>
To:     stable@...r.kernel.org
Cc:     damon@...ts.linux.dev, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org, SeongJae Park <sj@...nel.org>
Subject: Please merge commit 85c2ceaafbd3 ("mm/damon/sysfs: eliminate potential uninitialized variable warning") into >=5.19 stable trees

Please merge commit 85c2ceaafbd3 ("mm/damon/sysfs: eliminate potential
uninitialized variable warning") to >=5.19 stable kernels.

In 2023-10-31, I sent[1] a fix for v5.19.  After a week, Dan found an issue in
the fix and sent a fix.  At that time, the commit that Dan was fixing was
merged in the mm tree but not in the mainline.  Hence, Dan didn't Cc stable@.

However, now the broken fix[1] is merged in the mainline as commit 973233600676
("mm/damon/sysfs: update monitoring target regions for online input commit"),
and all >=5.19 stable trees.  Hence Dan's fix should also applied to those
trees.  Please apply those.

Note that the bug was only potential[3] due to unchecked return value.
However, the unchecked return value was not an intentional behavior but a bug.
Hence we further made the return value to be checked[4].  The return value
check fix is also merged in the relevant stable trees, so the fix is now needed
for a real bug.

[1] https://lore.kernel.org/all/20231031170131.46972-1-sj@kernel.org/
[2] https://lore.kernel.org/all/739e6aaf-a634-4e33-98a8-16546379ec9f@moroto.mountain/
[3] https://lore.kernel.org/all/20231106165205.48264-1-sj@kernel.org/
[4] https://lore.kernel.org/all/20231106233408.51159-1-sj@kernel.org/

Thanks,
SJ