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btrfs-progs: Fix one-byte overlap bug in free_block_group_cache

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free_block_group_cache() calls clear_extent_bits() with wrong end, which
is one byte larger than the correct range.

This will cause the next adjacent cache state to be split.  And due to
the split, private pointer (which points to block group cache) will be
reset to NULL.

This is very hard to detect as this function only gets called in
cleanup_temp_chunks() which is just before mkfs finishes.  This bug only
gets exposed when reworking --rootdir option.

Signed-off-by: Qu Wenruo <quwenruo.btrfs@gmx.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Qu Wenruo 2017-09-11 15:36:07 +09:00 committed by David Sterba
parent 02b58051e6
commit a7e555d706
1 changed files with 1 additions and 1 deletions
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2
extent-tree.c
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@ -3724,7 +3724,7 @@ static int free_block_group_cache(struct btrfs_trans_handle *trans,
btrfs_remove_free_space_cache(cache);
kfree(cache->free_space_ctl);
}
clear_extent_bits(&fs_info->block_group_cache, bytenr, bytenr + len,
clear_extent_bits(&fs_info->block_group_cache, bytenr, bytenr + len - 1,
(unsigned int)-1);
ret = free_space_info(fs_info, flags, len, 0, NULL);
if (ret < 0)