From 7c0f007cf589ac01e35d555d0c8d98f4a72396d4 Mon Sep 17 00:00:00 2001
From: Ronak Kanabar <ronak.kanabar@intel.com>
Date: Mon, 30 Nov 2020 15:40:51 +0530
Subject: [PATCH] src/acpi/acpigen: Add NULL pointer check

Add NULL pointer check in acpigen_emit_namestring
to avoid segmentation fault.

Change-Id: I3d01d28e74f202278b5a5a96d2edd45c66f10883
Signed-off-by: Ronak Kanabar <ronak.kanabar@intel.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/48148
Reviewed-by: Subrata Banik <subrata.banik@intel.com>
Reviewed-by: Maulik V Vaghela <maulik.v.vaghela@intel.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
---
 src/acpi/acpigen.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/acpi/acpigen.c b/src/acpi/acpigen.c
index 244ac548c9..9a5543d5a4 100644
--- a/src/acpi/acpigen.c
+++ b/src/acpi/acpigen.c
@@ -291,6 +291,10 @@ void acpigen_emit_namestring(const char *namepath)
 	int dotcount = 0, i;
 	int dotpos = 0;
 
+	/* Check for NULL pointer */
+	if (!namepath)
+		return;
+
 	/* We can start with a '\'. */
 	if (namepath[0] == '\\') {
 		acpigen_emit_byte('\\');