[PATCH 5.15 68/73] mm/damon/dbgfs: fix struct pid leaks in dbgfs_target_ids_write()

[Greg Kroah-Hartman]

From: SeongJae Park <sj@xxxxxxxxxx>

commit ebb3f994dd92f8fb4d70c7541091216c1e10cb71 upstream.

DAMON debugfs interface increases the reference counts of 'struct pid's
for targets from the 'target_ids' file write callback
('dbgfs_target_ids_write()'), but decreases the counts only in DAMON
monitoring termination callback ('dbgfs_before_terminate()').

Therefore, when 'target_ids' file is repeatedly written without DAMON
monitoring start/termination, the reference count is not decreased and
therefore memory for the 'struct pid' cannot be freed.  This commit
fixes this issue by decreasing the reference counts when 'target_ids' is
written.

Link: https://lkml.kernel.org/r/20211229124029.23348-1-sj@xxxxxxxxxx
Fixes: 4bc05954d007 ("mm/damon: implement a debugfs-based user space interface")
Signed-off-by: SeongJae Park <sj@xxxxxxxxxx>
Cc: <stable@xxxxxxxxxxxxxxx>	[5.15+]
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 mm/damon/dbgfs.c |    8 ++++++++
 1 file changed, 8 insertions(+)

--- a/mm/damon/dbgfs.c
+++ b/mm/damon/dbgfs.c
@@ -185,6 +185,7 @@ static ssize_t dbgfs_target_ids_write(st
 		const char __user *buf, size_t count, loff_t *ppos)
 {
 	struct damon_ctx *ctx = file->private_data;
+	struct damon_target *t, *next_t;
 	char *kbuf, *nrs;
 	unsigned long *targets;
 	ssize_t nr_targets;
@@ -224,6 +225,13 @@ static ssize_t dbgfs_target_ids_write(st
 		goto unlock_out;
 	}
 
+	/* remove previously set targets */
+	damon_for_each_target_safe(t, next_t, ctx) {
+		if (targetid_is_pid(ctx))
+			put_pid((struct pid *)t->id);
+		damon_destroy_target(t);
+	}
+
 	err = damon_set_targets(ctx, targets, nr_targets);
 	if (err) {
 		if (targetid_is_pid(ctx))