linux-kernel - [PATCH] mm/damon/sysfs: fix pid leak under fvaddr ops use case

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Date:   Tue,  3 May 2022 22:05:31 +0000
From:   SeongJae Park <sj@...nel.org>
To:     akpm@...ux-foundation.org
Cc:     damon@...ts.linux.dev, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org, SeongJae Park <sj@...nel.org>
Subject: [PATCH] mm/damon/sysfs: fix pid leak under fvaddr ops use case

Commit c83136469313 ("mm/damon/sysfs: support fixed virtual address
ranges monitoring") in 'mm-unstable' does not put the monitoring target
pid when fvaddr ops is used.  This commit fixes it to put pid properly.

Andrew, please merge this into the 'mm-unstable' commit
("mm/damon/sysfs: support fixed virtual address ranges monitoring").

Fixes: c83136469313 ("mm/damon/sysfs: support fixed virtual address ranges monitoring")
Signed-off-by: SeongJae Park <sj@...nel.org>
---
 mm/damon/sysfs.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/mm/damon/sysfs.c b/mm/damon/sysfs.c
index 767ab8c33e4d..f753bb405101 100644
--- a/mm/damon/sysfs.c
+++ b/mm/damon/sysfs.c
@@ -2086,7 +2086,8 @@ static void damon_sysfs_destroy_targets(struct damon_ctx *ctx)
 	struct damon_target *t, *next;
 
 	damon_for_each_target_safe(t, next, ctx) {
-		if (ctx->ops.id == DAMON_OPS_VADDR)
+		if (ctx->ops.id == DAMON_OPS_VADDR ||
+				ctx->ops.id == DAMON_OPS_FVADDR)
 			put_pid(t->pid);
 		damon_destroy_target(t);
 	}
@@ -2204,7 +2205,7 @@ static void damon_sysfs_before_terminate(struct damon_ctx *ctx)
 {
 	struct damon_target *t, *next;
 
-	if (ctx->ops.id != DAMON_OPS_VADDR)
+	if (ctx->ops.id != DAMON_OPS_VADDR && ctx->ops.id != DAMON_OPS_FVADDR)
 		return;
 
 	mutex_lock(&ctx->kdamond_lock);
-- 
2.25.1