linux-kernel - [PATCH] regmap: debugfs: Fix a reversed if statement in regmap_debugfs

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-ID: <X/RQpfAwRdLg0GqQ@mwanda>
Date:   Tue, 5 Jan 2021 14:42:29 +0300
From:   Dan Carpenter <dan.carpenter@...cle.com>
To:     Mark Brown <broonie@...nel.org>,
        Xiaolei Wang <xiaolei.wang@...driver.com>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: [PATCH] regmap: debugfs: Fix a reversed if statement in
 regmap_debugfs_init()

This code will leak "map->debugfs_name" because the if statement is
reversed so it only frees NULL pointers instead of non-NULL.  In
fact the if statement is not required and should just be removed
because kfree() accepts NULL pointers.

Fixes: cffa4b2122f5 ("regmap: debugfs: Fix a memory leak when calling regmap_attach_dev")
Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>
---
 drivers/base/regmap/regmap-debugfs.c | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/drivers/base/regmap/regmap-debugfs.c b/drivers/base/regmap/regmap-debugfs.c
index bf03cd343be2..ff2ee87987c7 100644
--- a/drivers/base/regmap/regmap-debugfs.c
+++ b/drivers/base/regmap/regmap-debugfs.c
@@ -594,9 +594,7 @@ void regmap_debugfs_init(struct regmap *map)
 	}
 
 	if (!strcmp(name, "dummy")) {
-		if (!map->debugfs_name)
-			kfree(map->debugfs_name);
-
+		kfree(map->debugfs_name);
 		map->debugfs_name = kasprintf(GFP_KERNEL, "dummy%d",
 						dummy_index);
 		if (!map->debugfs_name)
-- 
2.29.2