linux-kernel - [PATCH v2] ACPICA: check null return of ACPI_ALLOCATE_ZEROED in acpi_db_display

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Date:   Mon, 10 Apr 2023 17:36:01 +0800
From:   Kang Chen <void0red@...t.edu.cn>
To:     rafael@...nel.org
Cc:     acpica-devel@...ts.linuxfoundation.org, lenb@...nel.org,
        linux-acpi@...r.kernel.org, linux-kernel@...r.kernel.org,
        rafael.j.wysocki@...el.com, robert.moore@...el.com,
        void0red@...il.com
Subject: [PATCH v2] ACPICA: check null return of ACPI_ALLOCATE_ZEROED in acpi_db_display_objects

From: Kang Chen <void0red@...il.com>

ACPI_ALLOCATE_ZEROED may fails, object_info might be null and will
cause null pointer dereference later.

Link: https://github.com/acpica/acpica/commit/84b3752cfa0ce4b0ebecae5e193c937b8ed6e278
Signed-off-by: Kang Chen <void0red@...il.com>
---
v2 -> v1: add a github link

 drivers/acpi/acpica/dbnames.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/acpi/acpica/dbnames.c b/drivers/acpi/acpica/dbnames.c
index 3615e1a6e..b91155ea9 100644
--- a/drivers/acpi/acpica/dbnames.c
+++ b/drivers/acpi/acpica/dbnames.c
@@ -652,6 +652,9 @@ acpi_status acpi_db_display_objects(char *obj_type_arg, char *display_count_arg)
 		object_info =
 		    ACPI_ALLOCATE_ZEROED(sizeof(struct acpi_object_info));
 
+		if (!object_info)
+			return (AE_NO_MEMORY);
+
 		/* Walk the namespace from the root */
 
 		(void)acpi_walk_namespace(ACPI_TYPE_ANY, ACPI_ROOT_OBJECT,
-- 
2.34.1