Re: [PATCH] vhost: zero vhost_vsock memory on allocation

From: Vitaly Mayatskih
Date: Wed Mar 27 2019 - 13:09:07 EST

On Wed, Mar 27, 2019 at 12:49 PM Stefan Hajnoczi <stefanha@xxxxxxxxxx> wrote:

> Which field was accessed before initialization?
> I ask because the situation is now unclear since code remains that
> assumes vsock is *not* zero-initialized:
> vsock->guest_cid = 0; /* no CID assigned yet */
> atomic_set(&vsock->queued_replies, 0);

It was hash.

> If we're going to zalloc, let's get rid of explicit zero
> initializations. Or let's use kvmalloc() and fix the uninitialized
> access. Mixing both is confusing.

I would go with zalloc, since it's easier to read and it prevents
further situations like this.
A zalloc was there originally (not in fallback though).