linux-kernel - [PATCH] ACPICA: Fix memory leak then namespace lookup fails

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Message-Id: <20240403004718.11902-1-W_Armin@gmx.de>
Date: Wed,  3 Apr 2024 02:47:18 +0200
From: Armin Wolf <W_Armin@....de>
To: robert.moore@...el.com,
	rafael.j.wysocki@...el.com,
	lenb@...nel.org
Cc: dmantipov@...dex.ru,
	linux-acpi@...r.kernel.org,
	acpica-devel@...ts.linux.dev,
	linux-kernel@...r.kernel.org
Subject: [PATCH] ACPICA: Fix memory leak then namespace lookup fails

When acpi_ps_get_next_namepath() fails due to a namespace lookup
failure, the acpi_parse_object is not freed before returning the
error code, causing a memory leak.

Fix this by freeing the acpi_parse_object when encountering an
error.

Tested-by: Dmitry Antipov <dmantipov@...dex.ru>
Signed-off-by: Armin Wolf <W_Armin@....de>
---
 drivers/acpi/acpica/psargs.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/drivers/acpi/acpica/psargs.c b/drivers/acpi/acpica/psargs.c
index 422c074ed289..7debfd5ce0d8 100644
--- a/drivers/acpi/acpica/psargs.c
+++ b/drivers/acpi/acpica/psargs.c
@@ -820,6 +820,10 @@ acpi_ps_get_next_arg(struct acpi_walk_state *walk_state,
 			    acpi_ps_get_next_namepath(walk_state, parser_state,
 						      arg,
 						      ACPI_NOT_METHOD_CALL);
+			if (ACPI_FAILURE(status)) {
+				acpi_ps_free_op(arg);
+				return_ACPI_STATUS(status);
+			}
 		} else {
 			/* Single complex argument, nothing returned */

@@ -854,6 +858,10 @@ acpi_ps_get_next_arg(struct acpi_walk_state *walk_state,
 			    acpi_ps_get_next_namepath(walk_state, parser_state,
 						      arg,
 						      ACPI_POSSIBLE_METHOD_CALL);
+			if (ACPI_FAILURE(status)) {
+				acpi_ps_free_op(arg);
+				return_ACPI_STATUS(status);
+			}

 			if (arg->common.aml_opcode == AML_INT_METHODCALL_OP) {

--
2.39.2