linux-kernel - [PATCH 5/6] acpi: Check if @id is NULL in acpi_table

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Date:	Fri, 16 Aug 2013 15:06:48 +0800
From:	Tang Chen <tangchen@...fujitsu.com>
To:	tglx@...utronix.de, mingo@...hat.com, hpa@...or.com,
	lenb@...nel.org, rjw@...k.pl, liwanp@...ux.vnet.ibm.com,
	tj@...nel.org, akpm@...ux-foundation.org
Cc:	x86@...nel.org, linux-kernel@...r.kernel.org,
	linux-acpi@...r.kernel.org
Subject: [PATCH 5/6] acpi: Check if @id is NULL in acpi_table_parse()

strncmp() does not check if the params are NULL. In acpi_table_parse(),
if @id is NULL, the kernel will panic.

Signed-off-by: Tang Chen <tangchen@...fujitsu.com>
---
 drivers/acpi/tables.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/drivers/acpi/tables.c b/drivers/acpi/tables.c
index d67a1fe..5a5263b 100644
--- a/drivers/acpi/tables.c
+++ b/drivers/acpi/tables.c
@@ -293,7 +293,7 @@ int __init acpi_table_parse(char *id, acpi_tbl_table_handler handler)
 	if (acpi_disabled)
 		return -ENODEV;
 
-	if (!handler)
+	if (!id || !handler)
 		return -EINVAL;
 
 	if (strncmp(id, ACPI_SIG_MADT, 4) == 0)
-- 
1.7.1

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