From 214f6c2d4cedc84227b7ea453712ab9ddb373d0c Mon Sep 17 00:00:00 2001
From: Kevin O'Connor <kevin@koconnor.net>
Date: Sun, 26 Apr 2009 21:27:15 -0400
Subject: [PATCH] Exit CBFS file search early if zero signature found.

This stops the scan from walking all of flash.
---
 src/coreboot.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/src/coreboot.c b/src/coreboot.c
index cdb13ba..17c9531 100644
--- a/src/coreboot.c
+++ b/src/coreboot.c
@@ -331,8 +331,11 @@ cbfs_search(struct cbfs_file *file)
     for (;;) {
         if (file < (struct cbfs_file *)(0xFFFFFFFF - ntohl(CBHDR->romsize)))
             return NULL;
-        if (file->magic == CBFS_FILE_MAGIC)
+        u64 magic = file->magic;
+        if (magic == CBFS_FILE_MAGIC)
             return file;
+        if (magic == 0)
+            return NULL;
         file = (void*)file + ntohl(CBHDR->align);
     }
 }
-- 
2.39.5