From 7e8e4a7736aeaddb622871b92f843f7b426bcb88 Mon Sep 17 00:00:00 2001
From: dfr <dfr@FreeBSD.org>
Date: Sun, 23 May 2004 10:06:33 +0000
Subject: Don't crash if the CROM is all zeros.

---
 usr.sbin/fwcontrol/fwcontrol.c | 4 ++++
 1 file changed, 4 insertions(+)

(limited to 'usr.sbin/fwcontrol/fwcontrol.c')

diff --git a/usr.sbin/fwcontrol/fwcontrol.c b/usr.sbin/fwcontrol/fwcontrol.c
index a7465f5..99c13a6 100644
--- a/usr.sbin/fwcontrol/fwcontrol.c
+++ b/usr.sbin/fwcontrol/fwcontrol.c
@@ -326,6 +326,10 @@ show_crom(u_int32_t *crom_buf)
 
 	crom_init_context(&cc, crom_buf);
 	dir = cc.stack[0].dir;
+	if (!dir) {
+		printf("no root directory - giving up\n");
+		return;
+	}
 	printf("root_directory: len=0x%04x(%d) crc=0x%04x",
 			dir->crc_len, dir->crc_len, dir->crc);
 	crc = crom_crc((u_int32_t *)&dir->entry[0], dir->crc_len);
-- 
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