From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Pankaj Dubey , Mark Brown Subject: [PATCH 3.17 031/146] regmap: fix NULL pointer dereference in _regmap_write/read Date: Tue, 28 Oct 2014 11:32:53 +0800 Message-Id: <20141028033344.790371251@linuxfoundation.org> In-Reply-To: <20141028033343.441992423@linuxfoundation.org> References: <20141028033343.441992423@linuxfoundation.org> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Sender: linux-kernel-owner@vger.kernel.org List-ID: 3.17-stable review patch. If anyone has any objections, please let me know. ------------------ From: Pankaj Dubey commit 5336be8416a71b5568d2cf54a2f2066abe9f2a53 upstream. If LOG_DEVICE is defined and map->dev is NULL it will lead to NULL pointer dereference. This patch fixes this issue by adding check for dev->NULL in all such places in regmap.c Signed-off-by: Pankaj Dubey Signed-off-by: Mark Brown Signed-off-by: Greg Kroah-Hartman --- drivers/base/regmap/regmap.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) --- a/drivers/base/regmap/regmap.c +++ b/drivers/base/regmap/regmap.c @@ -1408,7 +1408,7 @@ int _regmap_write(struct regmap *map, un } #ifdef LOG_DEVICE - if (strcmp(dev_name(map->dev), LOG_DEVICE) == 0) + if (map->dev && strcmp(dev_name(map->dev), LOG_DEVICE) == 0) dev_info(map->dev, "%x <= %x\n", reg, val); #endif @@ -2058,7 +2058,7 @@ static int _regmap_read(struct regmap *m ret = map->reg_read(context, reg, val); if (ret == 0) { #ifdef LOG_DEVICE - if (strcmp(dev_name(map->dev), LOG_DEVICE) == 0) + if (map->dev && strcmp(dev_name(map->dev), LOG_DEVICE) == 0) dev_info(map->dev, "%x => %x\n", reg, *val); #endif