From: tangchen <tangchen@cn.fujitsu.com>
Date: Mon, 6 Jan 2014 08:43:54 +0000 (+0800)
Subject: ACPI / tables: Check if id is NULL in acpi_table_parse()
X-Git-Tag: next-20140107~67^2~8^2~1
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=de2d1a7e9310c4d1464faf469c737f08b5608600;p=karo-tx-linux.git

ACPI / tables: 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@cn.fujitsu.com>
Acked-by: Toshi Kani <toshi.kani@hp.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
---

diff --git a/drivers/acpi/tables.c b/drivers/acpi/tables.c
index 4ec44258e4ff..a17619bfb57b 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)