linux-kernel - [PATCH 01/10] mm/damon/core: initialize ->esz_bp from damos_quota_init

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Date: Fri,  3 May 2024 11:03:09 -0700
From: SeongJae Park <sj@...nel.org>
To: Andrew Morton <akpm@...ux-foundation.org>
Cc: SeongJae Park <sj@...nel.org>,
	damon@...ts.linux.dev,
	linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH 01/10] mm/damon/core: initialize ->esz_bp from damos_quota_init_priv()

damos_quota_init_priv() function should initialize all private fields of
struct damos_quota.  However, it is not initializing ->esz_bp field.
This could result in use of uninitialized variable from
damon_feed_loop_next_input() function.  There is no such issue at the
moment because every caller of the function is passing damos_quota
object that already having the field zero value.  But we cannot
guarantee the future, and the function is not doing what it is
promising.  A bug is a bug.  This fix is for preventing possible future
issues.

Fixes: 9294a037c015 ("mm/damon/core: implement goal-oriented feedback-driven quota auto-tuning")
Signed-off-by: SeongJae Park <sj@...nel.org>
---
 mm/damon/core.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/mm/damon/core.c b/mm/damon/core.c
index 172095e68c5d..6392f1cc97a3 100644
--- a/mm/damon/core.c
+++ b/mm/damon/core.c
@@ -346,6 +346,7 @@ static struct damos_quota *damos_quota_init(struct damos_quota *quota)
 	quota->charged_from = 0;
 	quota->charge_target_from = NULL;
 	quota->charge_addr_from = 0;
+	quota->esz_bp = 0;
 	return quota;
 }

-- 
2.39.2