block: reject block device inodes with i_rdev == 0 in lookup_bdev()#1027
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lookup_bdev() blindly returns inode->i_rdev without validating it.
When a FUSE filesystem exposes a root inode with S_IFBLK mode but
i_rdev == 0 (via rootmode=060000), any subsequent mount attempt using
that path as a block device source propagates dev_t 0 into the
superblock machinery. After commit 9ee5f161a4db ("fs: maintain a
global device-to-superblock table") this triggers a WARNING in
super_dev_register().
Reject i_rdev == 0 early with -ENODEV since no real block device
driver registers major 0.
Reported-by: syzbot+72fe3ea5814121fbc76e@syzkaller.appspotmail.com
Closes: https://syzkaller.appspot.com/bug?extid=72fe3ea5814121fbc76e
Signed-off-by: Yun Zhou <yun.zhou@windriver.com>
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Pull request for series with
subject: block: reject block device inodes with i_rdev == 0 in lookup_bdev()
version: 1
url: https://patchwork.kernel.org/project/linux-block/list/?series=1120933