Re: [PATCH] 9p: fix NULL pointer dereferences

[Dominique Martinet]

Dmitry Vyukov wrote on Thu, Jul 26, 2018:
> > Let's refuse that at much higher level, like v9fs_mount() in
> > fs/9p/vfs_super.c
> >
> > I can't think of any valid reason for dev_name to be NULL, it's the
> > target IP or virtio handle.
> 
> But I think trans=fd allows NULL addr today, no?

Ah, right, I read the patch too fast and read unix_create as fd_create,
I never realized there was a unix_create variant...

fd legitimately doesn't need a name, you are correct.

I'm really curious if anyone ever uses the unix/fd variants for "real"
stuff though! (not meaning syzbot isn't real, but I have yet to see
anything take advantage of this, even if I could imagine some fun
applications by piping the wmii libixp server socket.. and just crashed
my laptop trying because of the (fixed) trans put bug.. I have yet to
see anyone actually doing this)


On the other hand, virtio, rdma and xen all have the same problem, so
Thomas, please fix them instead :)

-- 
Dominique Martinet