This turned up when trying to resize a filesystem containing
a file with many extents on PPC64.
Fix all locations where ext3_extent_header members aren't
handled in an endian-safe manner.
Signed-off-by: Eric Sandeen <[email protected]>
---
I only audited ext3_extent_header's members, and found places
where they were not properly endian-handled.
Is there a reason that disk structures aren't sparse-annotated
for endianness? I can't help but wonder if there's a lot
more than this lurking.
diff --git a/lib/ext2fs/ext3_extents.h b/lib/ext2fs/ext3_extents.h
index 4163436..a18d705 100644
--- a/lib/ext2fs/ext3_extents.h
+++ b/lib/ext2fs/ext3_extents.h
@@ -106,15 +106,20 @@ struct ext3_ext_path {
((struct ext3_extent_idx *) (((char *) (__hdr__)) + \
sizeof(struct ext3_extent_header)))
#define EXT_HAS_FREE_INDEX(__path__) \
- ((__path__)->p_hdr->eh_entries < (__path__)->p_hdr->eh_max)
+ (ext2fs_le16_to_cpu((__path__)->p_hdr->eh_entries) < \
+ ext2fs_le16_to_cpu((__path__)->p_hdr->eh_max))
#define EXT_LAST_EXTENT(__hdr__) \
- (EXT_FIRST_EXTENT((__hdr__)) + (__hdr__)->eh_entries - 1)
+ (EXT_FIRST_EXTENT((__hdr__)) + \
+ ext2fs_le16_to_cpu((__hdr__)->eh_entries) - 1)
#define EXT_LAST_INDEX(__hdr__) \
- (EXT_FIRST_INDEX((__hdr__)) + (__hdr__)->eh_entries - 1)
+ (EXT_FIRST_INDEX((__hdr__)) + \
+ ext2fs_le16_to_cpu((__hdr__)->eh_entries) - 1)
#define EXT_MAX_EXTENT(__hdr__) \
- (EXT_FIRST_EXTENT((__hdr__)) + (__hdr__)->eh_max - 1)
+ (EXT_FIRST_EXTENT((__hdr__)) + \
+ ext2fs_le16_to_cpu((__hdr__)->eh_max) - 1)
#define EXT_MAX_INDEX(__hdr__) \
- (EXT_FIRST_INDEX((__hdr__)) + (__hdr__)->eh_max - 1)
+ (EXT_FIRST_INDEX((__hdr__)) + \
+ ext2fs_le16_to_cpu((__hdr__)->eh_max) - 1)
#endif /* _LINUX_EXT3_EXTENTS */
diff --git a/lib/ext2fs/inline_data.c b/lib/ext2fs/inline_data.c
index 7eb8b94..8167b76 100644
--- a/lib/ext2fs/inline_data.c
+++ b/lib/ext2fs/inline_data.c
@@ -420,7 +420,7 @@ ext2fs_inline_data_file_expand(ext2_filsys fs, ext2_ino_t ino,
eh = (struct ext3_extent_header *) &inode->i_block[0];
eh->eh_depth = 0;
eh->eh_entries = 0;
- eh->eh_magic = EXT3_EXT_MAGIC;
+ eh->eh_magic = ext2fs_cpu_to_le16(EXT3_EXT_MAGIC);
i = (sizeof(inode->i_block) - sizeof(*eh)) /
sizeof(struct ext3_extent);
eh->eh_max = ext2fs_cpu_to_le16(i);