btrfs: tree-checker: Verify block_group_item
A crafted image with invalid block group items could make free space cache code to cause panic. We could detect such invalid block group item by checking: 1) Item size Known fixed value. 2) Block group size (key.offset) We have an upper limit on block group item (10G) 3) Chunk objectid Known fixed value. 4) Type Only 4 valid type values, DATA, METADATA, SYSTEM and DATA|METADATA. No more than 1 bit set for profile type. 5) Used space No more than the block group size. This should allow btrfs to detect and refuse to mount the crafted image. Link: https://bugzilla.kernel.org/show_bug.cgi?id=199849Reported-by: NXu Wen <wen.xu@gatech.edu> Signed-off-by: NQu Wenruo <wqu@suse.com> Reviewed-by: NGu Jinxiang <gujx@cn.fujitsu.com> Reviewed-by: NNikolay Borisov <nborisov@suse.com> Tested-by: NGu Jinxiang <gujx@cn.fujitsu.com> Reviewed-by: NDavid Sterba <dsterba@suse.com> Signed-off-by: NDavid Sterba <dsterba@suse.com>
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