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Date: Tue, 28 Oct 2014 11:36:09 +0800 From: Greg Kroah-Hartman <gregkh@...uxfoundation.org> To: linux-kernel@...r.kernel.org Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>, stable@...r.kernel.org, Xiubo Li <Li.Xiubo@...escale.com>, Mark Brown <broonie@...nel.org> Subject: [PATCH 3.10 11/43] regmap: debugfs: fix possbile NULL pointer dereference 3.10-stable review patch. If anyone has any objections, please let me know. ------------------ From: Xiubo Li <Li.Xiubo@...escale.com> 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> Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org> --- drivers/base/regmap/regmap-debugfs.c | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-) --- a/drivers/base/regmap/regmap-debugfs.c +++ b/drivers/base/regmap/regmap-debugfs.c @@ -460,16 +460,20 @@ void regmap_debugfs_init(struct regmap * { struct rb_node *next; struct regmap_range_node *range_node; + const char *devname = "dummy"; 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); -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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