From 167ce953ca55bdee20fe56c3c0fa51002435f745 Mon Sep 17 00:00:00 2001 From: Liu Bo Date: Fri, 18 Aug 2017 15:15:18 -0600 Subject: Btrfs: add a helper to retrive extent inline ref type An invalid value of extent inline ref type may be read from a malicious image which may force btrfs to crash. This adds a helper which does sanity check for the ref type, so we can know if it's sane, return he type, otherwise return an error. Signed-off-by: Liu Bo Reviewed-by: David Sterba [ minimal tweak const types, causing warnings due to other cleanup patches ] Signed-off-by: David Sterba --- fs/btrfs/ctree.h | 11 +++++++++++ 1 file changed, 11 insertions(+) (limited to 'fs/btrfs/ctree.h') diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h index ca087ad5ac48..542db9d0dbcd 100644 --- a/fs/btrfs/ctree.h +++ b/fs/btrfs/ctree.h @@ -2567,6 +2567,17 @@ static inline gfp_t btrfs_alloc_write_mask(struct address_space *mapping) /* extent-tree.c */ +enum btrfs_inline_ref_type { + BTRFS_REF_TYPE_INVALID = 0, + BTRFS_REF_TYPE_BLOCK = 1, + BTRFS_REF_TYPE_DATA = 2, + BTRFS_REF_TYPE_ANY = 3, +}; + +int btrfs_get_extent_inline_ref_type(const struct extent_buffer *eb, + struct btrfs_extent_inline_ref *iref, + enum btrfs_inline_ref_type is_data); + u64 btrfs_csum_bytes_to_leaves(struct btrfs_fs_info *fs_info, u64 csum_bytes); static inline u64 btrfs_calc_trans_metadata_size(struct btrfs_fs_info *fs_info, -- cgit v1.2.3