linux-kernel - Re: [PATCH v3] virtio_blk: Fix a slient kernel panic

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Message-ID: <CAJSP0QUZ-=va4yOLMciG0V0L9N+XcDAcc82vVfdTw=RY-UXVcw@mail.gmail.com>
Date:	Fri, 29 Jul 2016 09:26:34 +0100
From:	Stefan Hajnoczi <stefanha@...il.com>
To:	Minfei Huang <mnfhuang@...il.com>
Cc:	"Michael S. Tsirkin" <mst@...hat.com>,
	Cornelia Huck <cornelia.huck@...ibm.com>,
	Minfei Huang <minfei.hmf@...baba-inc.com>,
	fanc.fnst@...fujitsu.com,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Minfei Huang <mnghuan@...il.com>,
	Linux Virtualization <virtualization@...ts.linux-foundation.org>
Subject: Re: [PATCH v3] virtio_blk: Fix a slient kernel panic

On Tue, Jul 19, 2016 at 5:32 AM, Minfei Huang <mnfhuang@...il.com> wrote:
> From: Minfei Huang <mnghuan@...il.com>
>
> We do a lot of memory allocation in function init_vq, and don't handle
> the allocation failure properly. Then this function will return 0,
> although initialization fails due to lacking memory. At that moment,
> kernel will panic in guest machine, if virtio is used to drive disk.
>
> To fix this bug, we should take care of allocation failure, and return
> correct value to let caller know what happen.
>
> Tested-by: Chao Fan <fanc.fnst@...fujitsu.com>
> Signed-off-by: Minfei Huang <minfei.hmf@...baba-inc.com>
> Signed-off-by: Minfei Huang <mnghuan@...il.com>
> ---
> v2:
> - Remove useless initialisation to NULL
> v1:
> - Refactor the patch to make code more readable
> ---
>  drivers/block/virtio_blk.c | 26 ++++++++------------------
>  1 file changed, 8 insertions(+), 18 deletions(-)

Reviewed-by: Stefan Hajnoczi <stefanha@...hat.com>