ext4: avoid divide by zero when trying to mount a corrupted file system
If s_log_groups_per_flex is greater than 31, then groups_per_flex will will overflow and cause a divide by zero error. This can cause kernel BUG if such a file system is mounted. Thanks to Nageswara R Sastry for analyzing the failure and providing an initial patch. http://bugzilla.kernel.org/show_bug.cgi?id=14287Signed-off-by: "Theodore Ts'o" <tytso@mit.edu> Cc: stable@kernel.org
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