This patch fixes a bug in determine_multiboot_type() that causes an
infinite loop while searching for a multiboot header.
diff --git a/tboot/common/loader.c b/tboot/common/loader.c
index 0a35545..cdc1c6d 100644
--- a/tboot/common/loader.c
+++ b/tboot/common/loader.c
@@ -1164,14 +1164,14 @@ determine_multiboot_type(void *image)
*/
int result = MB_NONE;
void *walker;
- for (walker = image; walker < walker + MULTIBOOT_HEADER_SEARCH_LIMIT;
+ for (walker = image; walker < image + MULTIBOOT_HEADER_SEARCH_LIMIT;
walker += sizeof(uint32_t)){
if (*((uint32_t *)walker) == MULTIBOOT_HEADER_MAGIC){
result += MB1_ONLY;
break;
}
}
- for (walker = image; walker < walker + MB2_HEADER_SEARCH_LIMIT;
+ for (walker = image; walker < image + MB2_HEADER_SEARCH_LIMIT;
walker += sizeof(uint64_t)){
if (*((uint32_t *)walker) == MB2_HEADER_MAGIC){
result += MB2_ONLY;
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