linux-kernel - [PATCH v3 2/4] platform/x86: hp-bioscfg: move mutex_lock() down in hp_add_other

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20231113185852.3579970-2-harshit.m.mogalapalli@oracle.com>
Date:   Mon, 13 Nov 2023 10:58:48 -0800
From:   Harshit Mogalapalli <harshit.m.mogalapalli@...cle.com>
To:     Jorge Lopez <jorge.lopez2@...com>,
        Hans de Goede <hdegoede@...hat.com>,
        Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>,
        Mark Gross <markgross@...nel.org>,
        Thomas Weißschuh <linux@...ssschuh.net>,
        platform-driver-x86@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     dan.carpenter@...aro.org, kernel-janitors@...r.kernel.org,
        error27@...il.com, vegard.nossum@...cle.com,
        harshit.m.mogalapalli@...cle.com, darren.kenny@...cle.com
Subject: [PATCH v3 2/4] platform/x86: hp-bioscfg: move mutex_lock() down in hp_add_other_attributes()

attr_name_kobj's memory allocation is done with mutex_lock() held, this
is not needed.

Move allocation outside of mutex_lock() so unlock is not needed when
allocation fails.

Suggested-by: Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
Signed-off-by: Harshit Mogalapalli <harshit.m.mogalapalli@...cle.com>
---
 drivers/platform/x86/hp/hp-bioscfg/bioscfg.c | 10 ++++------
 1 file changed, 4 insertions(+), 6 deletions(-)

diff --git a/drivers/platform/x86/hp/hp-bioscfg/bioscfg.c b/drivers/platform/x86/hp/hp-bioscfg/bioscfg.c
index 10676e1abc28..a3599498c4e8 100644
--- a/drivers/platform/x86/hp/hp-bioscfg/bioscfg.c
+++ b/drivers/platform/x86/hp/hp-bioscfg/bioscfg.c
@@ -575,79 +575,77 @@ static void release_attributes_data(void)
 /**
  * hp_add_other_attributes() - Initialize HP custom attributes not
  * reported by BIOS and required to support Secure Platform and Sure
  * Start.
  *
  * @attr_type: Custom HP attribute not reported by BIOS
  *
  * Initialize all 2 types of attributes: Platform and Sure Start
  * object.  Populates each attribute types respective properties
  * under sysfs files.
  *
  * Returns zero(0) if successful. Otherwise, a negative value.
  */
 static int hp_add_other_attributes(int attr_type)
 {
 	struct kobject *attr_name_kobj;
 	union acpi_object *obj = NULL;
 	int ret;
 	char *attr_name;
 
-	mutex_lock(&bioscfg_drv.mutex);
-
 	attr_name_kobj = kzalloc(sizeof(*attr_name_kobj), GFP_KERNEL);
-	if (!attr_name_kobj) {
-		ret = -ENOMEM;
-		goto err_other_attr_init;
-	}
+	if (!attr_name_kobj)
+		return -ENOMEM;
+
+	mutex_lock(&bioscfg_drv.mutex);
 
 	/* Check if attribute type is supported */
 	switch (attr_type) {
 	case HPWMI_SECURE_PLATFORM_TYPE:
 		attr_name_kobj->kset = bioscfg_drv.authentication_dir_kset;
 		attr_name = SPM_STR;
 		break;
 
 	case HPWMI_SURE_START_TYPE:
 		attr_name_kobj->kset = bioscfg_drv.main_dir_kset;
 		attr_name = SURE_START_STR;
 		break;
 
 	default:
 		pr_err("Error: Unknown attr_type: %d\n", attr_type);
 		ret = -EINVAL;
 		goto err_other_attr_init;
 	}
 
 	ret = kobject_init_and_add(attr_name_kobj, &attr_name_ktype,
 				   NULL, "%s", attr_name);
 	if (ret) {
 		pr_err("Error encountered [%d]\n", ret);
 		kobject_put(attr_name_kobj);
 		goto err_other_attr_init;
 	}
 
 	/* Populate attribute data */
 	switch (attr_type) {
 	case HPWMI_SECURE_PLATFORM_TYPE:
 		ret = hp_populate_secure_platform_data(attr_name_kobj);
 		break;
 
 	case HPWMI_SURE_START_TYPE:
 		ret = hp_populate_sure_start_data(attr_name_kobj);
 		break;
 
 	default:
 		ret = -EINVAL;
 	}
 
 	if (ret)
 		goto err_other_attr_init;
 
 	mutex_unlock(&bioscfg_drv.mutex);
 	return 0;
 
 err_other_attr_init:
 	mutex_unlock(&bioscfg_drv.mutex);
 	kfree(obj);
 	return ret;
 }
-- 
2.39.3