Btrfs: fix invalid leaf slot access in btrfs_lookup_extent()
If we couldn't find our extent item, we accessed the current slot (path->slots[0]) to check if it corresponds to an equivalent skinny metadata item. However this slot could be beyond our last item in the leaf (i.e. path->slots[0] >= btrfs_header_nritems(leaf)), in which case we shouldn't process it. Since btrfs_lookup_extent() is only used to find extent items for data extents, fix this by removing completely the logic that looks up for an equivalent skinny metadata item, since it can not exist. Signed-off-by:Filipe Manana <fdmanana@suse.com> Signed-off-by:
Chris Mason <clm@fb.com>
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