linux-kernel - [PATCH] platform/x86: hp-bioscfg: Fix some memory leaks in hp_populate_enumeration_elements_from

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Message-Id: <9770122e4e079dfa87d860ed86ba1a1237bcf944.1689627201.git.christophe.jaillet@wanadoo.fr>
Date:   Mon, 17 Jul 2023 22:53:37 +0200
From:   Christophe JAILLET <christophe.jaillet@...adoo.fr>
To:     Jorge Lopez <jorge.lopez2@...com>,
        Hans de Goede <hdegoede@...hat.com>,
        Mark Gross <markgross@...nel.org>,
        Thomas Weißschuh <linux@...ssschuh.net>
Cc:     linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org,
        Christophe JAILLET <christophe.jaillet@...adoo.fr>,
        platform-driver-x86@...r.kernel.org
Subject: [PATCH] platform/x86: hp-bioscfg: Fix some memory leaks in hp_populate_enumeration_elements_from_package()

In the loop in the ENUM_POSSIBLE_VALUES case, we allocate some memory that
is never freed.

While at it, add some "str_value = NULL" to avoid some potential double
free.

Fixes: 6b2770bfd6f9 ("platform/x86: hp-bioscfg: enum-attributes")
Signed-off-by: Christophe JAILLET <christophe.jaillet@...adoo.fr>
---
/!\ Speculative /!\

   This patch is based on analysis of the surrounding code and should be
   reviewed with care !

/!\ Speculative /!\
---
 drivers/platform/x86/hp/hp-bioscfg/enum-attributes.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/platform/x86/hp/hp-bioscfg/enum-attributes.c b/drivers/platform/x86/hp/hp-bioscfg/enum-attributes.c
index b1b241f0205a..dd173020c747 100644
--- a/drivers/platform/x86/hp/hp-bioscfg/enum-attributes.c
+++ b/drivers/platform/x86/hp/hp-bioscfg/enum-attributes.c
@@ -224,6 +224,7 @@ static int hp_populate_enumeration_elements_from_package(union acpi_object *enum
 					sizeof(enum_data->common.prerequisites[reqs]));
 
 				kfree(str_value);
+				str_value = NULL;
 			}
 			break;
 
@@ -275,6 +276,9 @@ static int hp_populate_enumeration_elements_from_package(union acpi_object *enum
 					strscpy(enum_data->possible_values[pos_values],
 						str_value,
 						sizeof(enum_data->possible_values[pos_values]));
+
+				kfree(str_value);
+				str_value = NULL;
 			}
 			break;
 		default:
@@ -283,6 +287,7 @@ static int hp_populate_enumeration_elements_from_package(union acpi_object *enum
 		}
 
 		kfree(str_value);
+		str_value = NULL;
 	}
 
 exit_enumeration_package:
-- 
2.34.1