linux-kernel - RE: [PATCH] drm/virtio: Ensure that objs is not NULL in virtio_gpu_array_put

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Message-ID: <4b0d93611e8740afbf25870e8b54a8e9@huawei.com>
Date:   Thu, 16 Dec 2021 15:12:35 +0000
From:   Roberto Sassu <roberto.sassu@...wei.com>
To:     "airlied@...ux.ie" <airlied@...ux.ie>,
        "kraxel@...hat.com" <kraxel@...hat.com>,
        "daniel@...ll.ch" <daniel@...ll.ch>
CC:     "dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
        "virtualization@...ts.linux-foundation.org" 
        <virtualization@...ts.linux-foundation.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "stable@...r.kernel.org" <stable@...r.kernel.org>,
        "syzbot+e9072e90624a31dfa85f@...kaller.appspotmail.com" 
        <syzbot+e9072e90624a31dfa85f@...kaller.appspotmail.com>
Subject: RE: [PATCH] drm/virtio: Ensure that objs is not NULL in
 virtio_gpu_array_put_free()

> From: Roberto Sassu
> Sent: Monday, December 13, 2021 7:31 PM
> If virtio_gpu_object_shmem_init() fails (e.g. due to fault injection, as it
> happened in the bug report by syzbot), virtio_gpu_array_put_free() could be
> called with objs equal to NULL.
> 
> Ensure that objs is not NULL in virtio_gpu_array_put_free(), or otherwise
> return from the function.

Hello

did you have the chance to look at this patch?

Thanks

Roberto

HUAWEI TECHNOLOGIES Duesseldorf GmbH, HRB 56063
Managing Director: Li Peng, Zhong Ronghua

> Cc: stable@...r.kernel.org # 5.13.x
> Signed-off-by: Roberto Sassu <roberto.sassu@...wei.com>
> Reported-by: syzbot+e9072e90624a31dfa85f@...kaller.appspotmail.com
> Fixes: 377f8331d0565 ("drm/virtio: fix possible leak/unlock
> virtio_gpu_object_array")
> ---
>  drivers/gpu/drm/virtio/virtgpu_gem.c | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/drivers/gpu/drm/virtio/virtgpu_gem.c
> b/drivers/gpu/drm/virtio/virtgpu_gem.c
> index 2de61b63ef91..48d3c9955f0d 100644
> --- a/drivers/gpu/drm/virtio/virtgpu_gem.c
> +++ b/drivers/gpu/drm/virtio/virtgpu_gem.c
> @@ -248,6 +248,9 @@ void virtio_gpu_array_put_free(struct
> virtio_gpu_object_array *objs)
>  {
>  	u32 i;
> 
> +	if (!objs)
> +		return;
> +
>  	for (i = 0; i < objs->nents; i++)
>  		drm_gem_object_put(objs->objs[i]);
>  	virtio_gpu_array_free(objs);
> --
> 2.32.0