linux-kernel - [PATCH] hwmon: (dell-smm) Fix warning on /proc/i8k creation error

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 for Android: free password hash cracker in your pocket

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

Message-Id: <20211112171440.59006-1-W_Armin@gmx.de>
Date:   Fri, 12 Nov 2021 18:14:40 +0100
From:   Armin Wolf <W_Armin@....de>
To:     pali@...nel.org
Cc:     jdelvare@...e.com, linux@...ck-us.net, linux-hwmon@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH] hwmon: (dell-smm) Fix warning on /proc/i8k creation error

The removal function is called regardless of whether
/proc/i8k was created successfully or not, the later
causing a WARN() on module removal.
Fix that by only registering the removal function
if /proc/i8k was created successfully.

Tested on a Inspiron 3505.

Fixes: 039ae58503f3 ("hwmon: Allow to compile dell-smm-hwmon driver without /proc/i8k")
Signed-off-by: Armin Wolf <W_Armin@....de>
---
 drivers/hwmon/dell-smm-hwmon.c | 7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)

diff --git a/drivers/hwmon/dell-smm-hwmon.c b/drivers/hwmon/dell-smm-hwmon.c
index eaace478f508..5596c211f38d 100644
--- a/drivers/hwmon/dell-smm-hwmon.c
+++ b/drivers/hwmon/dell-smm-hwmon.c
@@ -627,10 +627,9 @@ static void __init i8k_init_procfs(struct device *dev)
 {
 	struct dell_smm_data *data = dev_get_drvdata(dev);

-	/* Register the proc entry */
-	proc_create_data("i8k", 0, NULL, &i8k_proc_ops, data);
-
-	devm_add_action_or_reset(dev, i8k_exit_procfs, NULL);
+	/* Only register exit function if creation was successful */
+	if (proc_create_data("i8k", 0, NULL, &i8k_proc_ops, data))
+		devm_add_action_or_reset(dev, i8k_exit_procfs, NULL);
 }

 #else
--
2.30.2