ext2: Check block size validity during mount

stable inclusion
from stable-v5.10.181
commit 22ab5fed07ad4b206ea910fd0132d1a0d4831584
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I8GJZJ

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=22ab5fed07ad4b206ea910fd0132d1a0d4831584



--------------------------------

[ Upstream commit 62aeb944 ]

Check that log of block size stored in the superblock has sensible
value. Otherwise the shift computing the block size can overflow leading
to undefined behavior.

Reported-by:  <syzbot+4fec412f59eba8c01b77@syzkaller.appspotmail.com>
Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: sanglipeng <sanglipeng1@jd.com>