[U-Boot] [PATCH 3/3] cbfs: add support for cbfs header components

[Andre Heider <a.heider@gmail.com>]

This fixes walking the cbfs file list because the bound checks do not
apply to header components.

Output of coreboot's cbfstool:
    Name                           Offset     Type           Size   Comp
    cbfs master header             0x0        cbfs header        32 none
    fallback/romstage              0x80       stage           21344 none
    fallback/ramstage              0x5440     stage           36848 none
    config                         0xe480     raw               310 none
    revision                       0xe600     raw               575 none
    fallback/bl31                  0xe880     payload         15931 none
    fallback/payload               0x12700    payload        205449 none
    (empty)                        0x44a00    null           111768 none
    header pointer                 0x5fec0    cbfs header         4 none

Output of u-boot's cbfsls:
         size              type  name
    ------------------------------------------
           32       cbfs header  cbfs master header
        21344             stage  fallback/romstage
        36848             stage  fallback/ramstage
          310               raw  config
          575               raw  revision
        15931           payload  fallback/bl31
       205449           payload  fallback/payload
       111768              null  (empty)
            4       cbfs header  header pointer

Signed-off-by: Andre Heider <a.heider@gmail.com>
---
 cmd/cbfs.c     |  3 +++
 fs/cbfs/cbfs.c | 10 ++++++----
 include/cbfs.h |  1 +
 3 files changed, 10 insertions(+), 4 deletions(-)

diff --git a/cmd/cbfs.c b/cmd/cbfs.c
index 736f8c4527..f5ad04c45a 100644
--- a/cmd/cbfs.c
+++ b/cmd/cbfs.c
@@ -113,6 +113,9 @@ static int do_cbfs_ls(cmd_tbl_t *cmdtp, int flag, int argc,
 		printf(" %8d", file_cbfs_size(file));
 
 		switch (type) {
+		case CBFS_COMPONENT_CBFSHEADER:
+			type_name = "cbfs header";
+			break;
 		case CBFS_TYPE_STAGE:
 			type_name = "stage";
 			break;
diff --git a/fs/cbfs/cbfs.c b/fs/cbfs/cbfs.c
index 46da8f134f..389f60702b 100644
--- a/fs/cbfs/cbfs.c
+++ b/fs/cbfs/cbfs.c
@@ -97,10 +97,12 @@ static int file_cbfs_next_file(u8 *start, u32 size, u32 align,
 		}
 
 		swap_file_header(&header, fileHeader);
-		if (header.offset < sizeof(struct cbfs_fileheader) ||
-		    header.offset > header.len) {
-			file_cbfs_result = CBFS_BAD_FILE;
-			return -1;
+		if (header.type != CBFS_COMPONENT_CBFSHEADER) {
+			if (header.offset < sizeof(struct cbfs_fileheader) ||
+			    header.offset > header.len) {
+				file_cbfs_result = CBFS_BAD_FILE;
+				return -1;
+			}
 		}
 		newNode->next = NULL;
 		newNode->type = header.type;
diff --git a/include/cbfs.h b/include/cbfs.h
index f50280107b..d5d9d8ce97 100644
--- a/include/cbfs.h
+++ b/include/cbfs.h
@@ -19,6 +19,7 @@ enum cbfs_result {
 };
 
 enum cbfs_filetype {
+	CBFS_COMPONENT_CBFSHEADER = 0x02,
 	CBFS_TYPE_STAGE = 0x10,
 	CBFS_TYPE_PAYLOAD = 0x20,
 	CBFS_TYPE_OPTIONROM = 0x30,
-- 
2.16.1