From 0ebb6bbbd499987248b4ce8f4f7c5eeb6e1fa905 Mon Sep 17 00:00:00 2001 From: Josef Bacik Date: Fri, 12 Mar 2021 15:25:26 -0500 Subject: [PATCH] btrfs: tree-checker: check for BTRFS_BLOCK_FLAG_FULL_BACKREF being set improperly We need to validate that a data extent item does not have the FULL_BACKREF flag set on its flags. Reviewed-by: Qu Wenruo Signed-off-by: Josef Bacik Reviewed-by: David Sterba Signed-off-by: David Sterba --- fs/btrfs/tree-checker.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/fs/btrfs/tree-checker.c b/fs/btrfs/tree-checker.c index f4ade82..a8b2e0d 100644 --- a/fs/btrfs/tree-checker.c +++ b/fs/btrfs/tree-checker.c @@ -1290,6 +1290,11 @@ static int check_extent_item(struct extent_buffer *leaf, key->offset, fs_info->sectorsize); return -EUCLEAN; } + if (unlikely(flags & BTRFS_BLOCK_FLAG_FULL_BACKREF)) { + extent_err(leaf, slot, + "invalid extent flag, data has full backref set"); + return -EUCLEAN; + } } ptr = (unsigned long)(struct btrfs_extent_item *)(ei + 1); -- 2.7.4