ext4: validate the debug_want_extra_isize mount option at parse time

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Instead of setting s_want_extra_size and then making sure that it is a
valid value afterwards, validate the field before we set it.  This
avoids races and other problems when remounting the file system.

Link: https://lore.kernel.org/r/20191215063020.GA11512@mit.edu
Cc: stable@kernel.org
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Reported-and-tested-by: syzbot+4a39a025912b265cacef@syzkaller.appspotmail.com

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Theodore Ts'o 2019-12-15 01:09:03 -05:00

parent a70fd5ac2e

commit 9803387c55

1 changed files with 69 additions and 74 deletions

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fs/ext4/super.c

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