tree 9f37838aacc89eddbd654c4c1513889cf491b25f
parent 956e2a0e6779824877822864ad486f08184f1a3e
author Theodore Ts'o <tytso@mit.edu> 1479494267 -0500
committer Greg Kroah-Hartman <gregkh@linuxfoundation.org> 1483695614 +0100

ext4: add sanity checking to count_overhead()

commit c48ae41bafe31e9a66d8be2ced4e42a6b57fa814 upstream.

The commit "ext4: sanity check the block and cluster size at mount
time" should prevent any problems, but in case the superblock is
modified while the file system is mounted, add an extra safety check
to make sure we won't overrun the allocated buffer.

Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>