ext2: Check block size validity during mount
[ 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>
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