ext4: make sanity check in mballoc more strict
The sanity check in mb_find_extent() only checked that returned extent does not extend past blocksize * 8, however it should not extend past EXT4_CLUSTERS_PER_GROUP(sb). This can happen when clusters_per_group < blocksize * 8 and the tail of the bitmap is not properly filled by 1s which happened e.g. when ancient kernels have grown the filesystem. Signed-off-by:Jan Kara <jack@suse.cz> Signed-off-by:
Theodore Ts'o <tytso@mit.edu> Cc: stable@kernel.org
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