--- sys/dev/asmc/asmc.c	2008-11-22 14:39:53.000000000 +0800
+++ /var/current/mysrc/sys/dev/asmc/asmc.c	2008-11-24 12:46:16.000000000 +0800
@@ -254,6 +254,8 @@
 	char *model;
 
 	model = getenv("smbios.system.product");
+	if (model == NULL)
+		return (NULL);
 	for (i = 0; asmc_models[i].smc_model; i++) {
 		if (!strncmp(model, asmc_models[i].smc_model, strlen(model))) {
 			freeenv(model);