linux-kernel - [PATCH] of: overlay: Stop leaking resources on overlay removal

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Message-ID: <097f1b01-6cb4-8dcb-0498-7b4c59a7ea53@siemens.com>
Date:   Tue, 24 Apr 2018 18:19:55 +0200
From:   Jan Kiszka <jan.kiszka@...mens.com>
To:     Pantelis Antoniou <pantelis.antoniou@...sulko.com>,
        Rob Herring <robh+dt@...nel.org>,
        Frank Rowand <frowand.list@...il.com>,
        devicetree <devicetree@...r.kernel.org>
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Alan Tull <atull@...nel.org>
Subject: [PATCH] of: overlay: Stop leaking resources on overlay removal

Only the overlay notifier callbacks have a chance to potentially get
hold of references to those two resources, but they do not store them.
So it is safe to stop the intentional leaking.

See also https://lkml.org/lkml/2018/4/23/1063 and following.

Signed-off-by: Jan Kiszka <jan.kiszka@...mens.com>
---

Ideally, we sort out any remaining worries during the 4.17-rc cycle.

 drivers/of/overlay.c | 13 ++-----------
 1 file changed, 2 insertions(+), 11 deletions(-)

diff --git a/drivers/of/overlay.c b/drivers/of/overlay.c
index b35fe88f1851..3553f1f57a62 100644
--- a/drivers/of/overlay.c
+++ b/drivers/of/overlay.c
@@ -671,17 +671,8 @@ static void free_overlay_changeset(struct overlay_changeset *ovcs)
 		of_node_put(ovcs->fragments[i].overlay);
 	}
 	kfree(ovcs->fragments);
-
-	/*
-	 * TODO
-	 *
-	 * would like to: kfree(ovcs->overlay_tree);
-	 * but can not since drivers may have pointers into this data
-	 *
-	 * would like to: kfree(ovcs->fdt);
-	 * but can not since drivers may have pointers into this data
-	 */
-
+	kfree(ovcs->overlay_tree);
+	kfree(ovcs->fdt);
 	kfree(ovcs);
 }
 
-- 
2.13.6