diff options
| author | Xiubo Li <Li.Xiubo@freescale.com> | 2014-09-28 07:35:25 +0400 |
|---|---|---|
| committer | Mark Brown <broonie@kernel.org> | 2014-09-28 14:49:56 +0400 |
| commit | 2c98e0c1cc6b8e86f1978286c3d4e0769ee9d733 (patch) | |
| tree | cf818461ea3155d8be7e5dd4ff068b936b691282 /drivers/base/regmap/regmap-debugfs.c | |
| parent | 7d1311b93e58ed55f3a31cc8f94c4b8fe988a2b9 (diff) | |
| download | linux-2c98e0c1cc6b8e86f1978286c3d4e0769ee9d733.tar.xz | |
regmap: debugfs: fix possbile NULL pointer dereference
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@freescale.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
Cc: stable@vger.kernel.org
Diffstat (limited to 'drivers/base/regmap/regmap-debugfs.c')
| -rw-r--r-- | drivers/base/regmap/regmap-debugfs.c | 8 |
1 files changed, 6 insertions, 2 deletions
diff --git a/drivers/base/regmap/regmap-debugfs.c b/drivers/base/regmap/regmap-debugfs.c index 45d812c0ea77..bdd88708e4d6 100644 --- a/drivers/base/regmap/regmap-debugfs.c +++ b/drivers/base/regmap/regmap-debugfs.c @@ -473,6 +473,7 @@ void regmap_debugfs_init(struct regmap *map, const char *name) { struct rb_node *next; struct regmap_range_node *range_node; + const char *devname = "dummy"; /* If we don't have the debugfs root yet, postpone init */ if (!regmap_debugfs_root) { @@ -491,12 +492,15 @@ void regmap_debugfs_init(struct regmap *map, const char *name) INIT_LIST_HEAD(&map->debugfs_off_cache); mutex_init(&map->cache_lock); + if (map->dev) + devname = dev_name(map->dev); + if (name) { map->debugfs_name = kasprintf(GFP_KERNEL, "%s-%s", - dev_name(map->dev), name); + devname, name); name = map->debugfs_name; } else { - name = dev_name(map->dev); + name = devname; } map->debugfs = debugfs_create_dir(name, regmap_debugfs_root); |