linux-kernel - [PATCH 2/2] of: overlay: fix target

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Date:   Mon, 18 Nov 2019 14:28:09 +0100
From:   Vincent Whitchurch <vincent.whitchurch@...s.com>
To:     pantelis.antoniou@...sulko.com, frowand.list@...il.com,
        robh+dt@...nel.org
Cc:     devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        Vincent Whitchurch <rabinv@...s.com>
Subject: [PATCH 2/2] of: overlay: fix target_path memory leak

target_path is used as a temporary buffer in dup_and_fixup_symbol_prop()
and should be freed even in the success path.

This was detected by kmemleak.

 unreferenced object 0x8598f6c0 (size 64):
   backtrace:
     __kmalloc_track_caller+0x17d/0x228
     kvasprintf+0x2b/0x64
     kasprintf+0x15/0x20
     add_changeset_property+0x225/0x364
     of_overlay_fdt_apply+0x42d/0x6b4
     ...

Fixes: e0a58f3e08d4b7fa ("of: overlay: remove a dependency on device node full_name")
Signed-off-by: Vincent Whitchurch <vincent.whitchurch@...s.com>
---
 drivers/of/overlay.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/of/overlay.c b/drivers/of/overlay.c
index 5f8869e2a8b3..59455322a130 100644
--- a/drivers/of/overlay.c
+++ b/drivers/of/overlay.c
@@ -261,6 +261,8 @@ static struct property *dup_and_fixup_symbol_prop(
 
 	of_property_set_flag(new_prop, OF_DYNAMIC);
 
+	kfree(target_path);
+
 	return new_prop;
 
 err_free_new_prop:
-- 
2.20.0