linux-kernel - [PATCH v2 1/2] platform/x86: think-lmi: Fix memory leaks when parsing ThinkStation WMI strings

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-next>] [day] [month] [year] [list]

Message-Id: <20230403013120.2105-1-mpearson-lenovo@squebb.ca>
Date:   Sun,  2 Apr 2023 21:31:19 -0400
From:   Mark Pearson <mpearson-lenovo@...ebb.ca>
To:     mpearson-lenovo@...ebb.ca
Cc:     hdegoede@...hat.com, markgross@...nel.org, W_Armin@....de,
        mirsad.todorovac@....unizg.hr, linux@...ssschuh.net,
        Mario.Limonciello@....com, platform-driver-x86@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH v2 1/2] platform/x86: think-lmi: Fix memory leaks when parsing ThinkStation WMI strings

My previous commit introduced a memory leak where the item allocated
from tlmi_setting was not freed.
This commit also renames it to avoid confusion with the similarly name
variable in the same function.

Fixes: 8a02d70679fc ("platform/x86: think-lmi: Add possible_values for ThinkStation")
Reported-by: Mirsad Todorovac <mirsad.todorovac@....unizg.hr>
Link: https://lore.kernel.org/lkml/df26ff45-8933-f2b3-25f4-6ee51ccda7d8@gmx.de/T/
Signed-off-by: Mark Pearson <mpearson-lenovo@...ebb.ca>
---
This patch series builds on top of the proposed patch from Armin Wolf
"platform/x86: think-lmi: Fix memory leak when showing current settings"
Changes in v2: None, but rebased series because of issues with second
patch.

 drivers/platform/x86/think-lmi.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/drivers/platform/x86/think-lmi.c b/drivers/platform/x86/think-lmi.c
index 6034df6d577d..87f832142d8d 100644
--- a/drivers/platform/x86/think-lmi.c
+++ b/drivers/platform/x86/think-lmi.c
@@ -1459,10 +1459,10 @@ static int tlmi_analyze(void)
 			 * name string.
 			 * Try and pull that out if it's available.
 			 */
-			char *item, *optstart, *optend;
+			char *optitem, *optstart, *optend;
 
-			if (!tlmi_setting(setting->index, &item, LENOVO_BIOS_SETTING_GUID)) {
-				optstart = strstr(item, "[Optional:");
+			if (!tlmi_setting(setting->index, &optitem, LENOVO_BIOS_SETTING_GUID)) {
+				optstart = strstr(optitem, "[Optional:");
 				if (optstart) {
 					optstart += strlen("[Optional:");
 					optend = strstr(optstart, "]");
@@ -1471,6 +1471,7 @@ static int tlmi_analyze(void)
 							kstrndup(optstart, optend - optstart,
 									GFP_KERNEL);
 				}
+				kfree(optitem);
 			}
 		}
 		/*
-- 
2.39.2