Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752584Ab2JIGIi (ORCPT ); Tue, 9 Oct 2012 02:08:38 -0400 Received: from mail-qc0-f174.google.com ([209.85.216.174]:38957 "EHLO mail-qc0-f174.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752252Ab2JIGDL (ORCPT ); Tue, 9 Oct 2012 02:03:11 -0400 From: Len Brown To: linux-acpi@vger.kernel.org, linux-pm@vger.kernel.org Cc: linux-kernel@vger.kernel.org, Guenter Roeck , Zhang Rui Subject: [PATCH 16/30] thermal: Fix potential NULL pointer accesses Date: Tue, 9 Oct 2012 01:54:06 -0400 Message-Id: <204dd1d39c32f39a95bf7a7248f63b372fd137a6.1349761836.git.len.brown@intel.com> X-Mailer: git-send-email 1.8.0.rc1 In-Reply-To: <1349762060-25334-1-git-send-email-lenb@kernel.org> References: <1349762060-25334-1-git-send-email-lenb@kernel.org> In-Reply-To: References: Reply-To: Len Brown Organization: Intel Open Source Technology Center Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2148 Lines: 63 From: Guenter Roeck The type parameter in thermal_zone_device_register and thermal_cooling_device_register can be NULL, indicating that no sysfs attribute for the type should be created. Only call strlen() and strcpy() on type if it is not NULL. This patch addresses Coverity #102180 and #102182: Dereference before null check Signed-off-by: Guenter Roeck Signed-off-by: Zhang Rui --- drivers/thermal/thermal_sys.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) diff --git a/drivers/thermal/thermal_sys.c b/drivers/thermal/thermal_sys.c index 36e6f4d..47498b8 100644 --- a/drivers/thermal/thermal_sys.c +++ b/drivers/thermal/thermal_sys.c @@ -901,7 +901,7 @@ thermal_cooling_device_register(char *type, void *devdata, struct thermal_zone_device *pos; int result; - if (strlen(type) >= THERMAL_NAME_LENGTH) + if (type && strlen(type) >= THERMAL_NAME_LENGTH) return ERR_PTR(-EINVAL); if (!ops || !ops->get_max_state || !ops->get_cur_state || @@ -918,7 +918,7 @@ thermal_cooling_device_register(char *type, void *devdata, return ERR_PTR(result); } - strcpy(cdev->type, type); + strcpy(cdev->type, type ? : ""); mutex_init(&cdev->lock); INIT_LIST_HEAD(&cdev->thermal_instances); cdev->ops = ops; @@ -1344,7 +1344,7 @@ struct thermal_zone_device *thermal_zone_device_register(const char *type, int count; int passive = 0; - if (strlen(type) >= THERMAL_NAME_LENGTH) + if (type && strlen(type) >= THERMAL_NAME_LENGTH) return ERR_PTR(-EINVAL); if (trips > THERMAL_MAX_TRIPS || trips < 0 || mask >> trips) @@ -1366,7 +1366,7 @@ struct thermal_zone_device *thermal_zone_device_register(const char *type, return ERR_PTR(result); } - strcpy(tz->type, type); + strcpy(tz->type, type ? : ""); tz->ops = ops; tz->device.class = &thermal_class; tz->devdata = devdata; -- 1.8.0.rc1 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/