linux-kernel - Re: [PATCH] vhost: initialize vq->nheads properly

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Message-ID: <CACGkMEuNx_7Q_Jq+xcE83fwbFa2uVZkrqr0Nx=1pxcZuFkO91w@mail.gmail.com>
Date: Mon, 4 Aug 2025 17:05:57 +0800
From: Jason Wang <jasowang@...hat.com>
To: mst@...hat.com, jasowang@...hat.com, eperezma@...hat.com
Cc: kvm@...r.kernel.org, virtualization@...ts.linux.dev, 
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org, sgarzare@...hat.com, 
	will@...nel.org, JAEHOON KIM <jhkim@...ux.ibm.com>, Breno Leitao <leitao@...ian.org>
Subject: Re: [PATCH] vhost: initialize vq->nheads properly

Hi Michael:

On Tue, Jul 29, 2025 at 3:39 PM Jason Wang <jasowang@...hat.com> wrote:
>
> Commit 7918bb2d19c9 ("vhost: basic in order support") introduces
> vq->nheads to store the number of batched used buffers per used elem
> but it forgets to initialize the vq->nheads to NULL in
> vhost_dev_init() this will cause kfree() that would try to free it
> without be allocated if SET_OWNER is not called.
>
> Reported-by: JAEHOON KIM <jhkim@...ux.ibm.com>
> Reported-by: Breno Leitao <leitao@...ian.org>
> Fixes: 7918bb2d19c9 ("vhost: basic in order support")
> Signed-off-by: Jason Wang <jasowang@...hat.com>

I didn't see this in your pull request.

Thanks