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

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Message-ID: <nswdjfxtogobamp7bqktyrihl4w6xs2jnvxjofdvqoxqtvjp5s@vrsdmzuvsvx4>
Date: Tue, 29 Jul 2025 02:11:39 -0700
From: Breno Leitao <leitao@...ian.org>
To: Jason Wang <jasowang@...hat.com>
Cc: mst@...hat.com, eperezma@...hat.com, 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>
Subject: Re: [PATCH] vhost: initialize vq->nheads properly

On Tue, Jul 29, 2025 at 03:39:16PM +0800, Jason Wang 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>

Tested-by: Breno Leitao <leitao@...ian.org>