linux-kernel - [PATCH 3.4 031/177] regmap: debugfs: fix possbile NULL pointer dereference

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Date:	Wed, 28 Jan 2015 12:07:09 +0800
From:	lizf@...nel.org
To:	stable@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, Xiubo Li <Li.Xiubo@...escale.com>,
	Mark Brown <broonie@...nel.org>, Zefan Li <lizefan@...wei.com>
Subject: [PATCH 3.4 031/177] regmap: debugfs: fix possbile NULL pointer dereference

From: Xiubo Li <Li.Xiubo@...escale.com>

3.4.106-rc1 review patch.  If anyone has any objections, please let me know.

------------------


commit 2c98e0c1cc6b8e86f1978286c3d4e0769ee9d733 upstream.

If 'map->dev' is NULL and there will lead dev_name() to be NULL pointer
dereference. So before dev_name(), we need to have check of the map->dev
pionter.

We also should make sure that the 'name' pointer shouldn't be NULL for
debugfs_create_dir(). So here using one default "dummy" debugfs name when
the 'name' pointer and 'map->dev' are both NULL.

Signed-off-by: Xiubo Li <Li.Xiubo@...escale.com>
Signed-off-by: Mark Brown <broonie@...nel.org>
[lizf: Backported to 3.4: dev_name() is passed to debugfs_create_dir() in 3.4]
Signed-off-by: Zefan Li <lizefan@...wei.com>
---
 drivers/base/regmap/regmap-debugfs.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/drivers/base/regmap/regmap-debugfs.c b/drivers/base/regmap/regmap-debugfs.c
index 8ab1eab..1db1289 100644
--- a/drivers/base/regmap/regmap-debugfs.c
+++ b/drivers/base/regmap/regmap-debugfs.c
@@ -244,7 +244,12 @@ static const struct file_operations regmap_access_fops = {
 
 void regmap_debugfs_init(struct regmap *map)
 {
-	map->debugfs = debugfs_create_dir(dev_name(map->dev),
+	const char *devname = "dummy";
+
+	if (map->dev)
+		devname = dev_name(map->dev);
+
+	map->debugfs = debugfs_create_dir(devname,
 					  regmap_debugfs_root);
 	if (!map->debugfs) {
 		dev_warn(map->dev, "Failed to create debugfs directory\n");
-- 
1.9.1

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