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authorQu Wenruo <wqu@suse.com>2024-08-12 01:22:44 +0200
committerDavid Sterba <dsterba@suse.com>2024-08-13 13:42:26 +0200
commit31723c9542dba1681cc3720571fdf12ffe0eddd9 (patch)
tree359ec1f61cbfac5e845e9d1febfe35db4b6a202a /fs/btrfs
parentbtrfs: check delayed refs when we're checking if a ref exists (diff)
downloadlinux-31723c9542dba1681cc3720571fdf12ffe0eddd9.tar.xz
linux-31723c9542dba1681cc3720571fdf12ffe0eddd9.zip
btrfs: tree-checker: reject BTRFS_FT_UNKNOWN dir type
[REPORT] There is a bug report that kernel is rejecting a mismatching inode mode and its dir item: [ 1881.553937] BTRFS critical (device dm-0): inode mode mismatch with dir: inode mode=040700 btrfs type=2 dir type=0 [CAUSE] It looks like the inode mode is correct, while the dir item type 0 is BTRFS_FT_UNKNOWN, which should not be generated by btrfs at all. This may be caused by a memory bit flip. [ENHANCEMENT] Although tree-checker is not able to do any cross-leaf verification, for this particular case we can at least reject any dir type with BTRFS_FT_UNKNOWN. So here we enhance the dir type check from [0, BTRFS_FT_MAX), to (0, BTRFS_FT_MAX). Although the existing corruption can not be fixed just by such enhanced checking, it should prevent the same 0x2->0x0 bitflip for dir type to reach disk in the future. Reported-by: Kota <nospam@kota.moe> Link: https://lore.kernel.org/linux-btrfs/CACsxjPYnQF9ZF-0OhH16dAx50=BXXOcP74MxBc3BG+xae4vTTw@mail.gmail.com/ CC: stable@vger.kernel.org # 5.4+ Signed-off-by: Qu Wenruo <wqu@suse.com> Signed-off-by: David Sterba <dsterba@suse.com>
Diffstat (limited to 'fs/btrfs')
-rw-r--r--fs/btrfs/tree-checker.c5
1 files changed, 3 insertions, 2 deletions
diff --git a/fs/btrfs/tree-checker.c b/fs/btrfs/tree-checker.c
index a825fa598e3c..6f1e2f2215d9 100644
--- a/fs/btrfs/tree-checker.c
+++ b/fs/btrfs/tree-checker.c
@@ -569,9 +569,10 @@ static int check_dir_item(struct extent_buffer *leaf,
/* dir type check */
dir_type = btrfs_dir_ftype(leaf, di);
- if (unlikely(dir_type >= BTRFS_FT_MAX)) {
+ if (unlikely(dir_type <= BTRFS_FT_UNKNOWN ||
+ dir_type >= BTRFS_FT_MAX)) {
dir_item_err(leaf, slot,
- "invalid dir item type, have %u expect [0, %u)",
+ "invalid dir item type, have %u expect (0, %u)",
dir_type, BTRFS_FT_MAX);
return -EUCLEAN;
}