From e8f8dbdb390ea112fa13a0d369a4bcfc34174cde Mon Sep 17 00:00:00 2001
From: allanjude <allanjude@FreeBSD.org>
Date: Sat, 13 Jun 2015 05:55:26 +0000
Subject: [PATCH] acpi_ibm.ko panics if SMBIOS information is not available

Add a check for NULL before strcmp on smbios information incase it is not populated

Differential Revision:	https://reviews.freebsd.org/D2750
Reviewed by:	ngie, jhb
Approved by:	rpaulo
Sponsored by:	ScaleEngine Inc.
---
 sys/dev/acpi_support/acpi_ibm.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/sys/dev/acpi_support/acpi_ibm.c b/sys/dev/acpi_support/acpi_ibm.c
index 11636815c318..f8ff1ebca347 100644
--- a/sys/dev/acpi_support/acpi_ibm.c
+++ b/sys/dev/acpi_support/acpi_ibm.c
@@ -485,6 +485,9 @@ acpi_ibm_attach(device_t dev)
 	/* Enable per-model events. */
 	maker = kern_getenv("smbios.system.maker");
 	product = kern_getenv("smbios.system.product");
+	if (maker != NULL && product != NULL)
+		goto nosmbios;
+
 	for (i = 0; i < nitems(acpi_ibm_models); i++) {
 		if (strcmp(maker, acpi_ibm_models[i].maker) == 0 &&
 		    strcmp(product, acpi_ibm_models[i].product) == 0) {
@@ -494,6 +497,8 @@ acpi_ibm_attach(device_t dev)
 			ACPI_SERIAL_END(ibm);
 		}
 	}
+
+nosmbios:
 	freeenv(maker);
 	freeenv(product);