ext4: verify group number in verify_group_input() before using it
ext4: verify group number in verify_group_input() before using it

Check the group number for sanity earilier, before calling routines
such as ext4_bg_has_super() or ext4_group_overhead_blocks().

Reported-by: Jonathan Salwan <20400441dc6e7145bff2464b9bb29e566a9454cd@gmail.com>
Signed-off-by: "Theodore Ts'o" <4ed386e0495d3e109932df055831d9ec2f824927@mit.edu>

KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs