fsu d3ae4ea893 Make superblock reading logic more strict.
Add more on-disk superblock consistency checks to ext2_compute_sb_data() function.
It should decrease the probability of mounting filesystems with corrupted superblock data.

Reviewed by:    pfg
MFC after:      1 week

Differential Revision:    https://reviews.freebsd.org/D19322
2019-03-04 10:42:25 +00:00
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