netdev - Re: [PATCH 1/1] virtio_net: Fix "‘%d’ directive writing between 1 and 11 bytes into a region of size 10" warnings

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Message-ID: <1703594592.3934712-1-xuanzhuo@linux.alibaba.com>
Date: Tue, 26 Dec 2023 20:43:12 +0800
From: Xuan Zhuo <xuanzhuo@...ux.alibaba.com>
To: Zhu Yanjun <yanjun.zhu@...ux.dev>
Cc: Zhu Yanjun <yanjun.zhu@...el.com>,
 mst@...hat.com,
 jasowang@...hat.com,
 davem@...emloft.net,
 edumazet@...gle.com,
 kuba@...nel.org,
 pabeni@...hat.com,
 virtualization@...ts.linux.dev,
 netdev@...r.kernel.org
Subject: Re: [PATCH 1/1] virtio_net: Fix "‘%d’ directive writing between 1 and 11 bytes into a region of size 10" warnings

On Tue, 26 Dec 2023 19:53:58 +0800, Zhu Yanjun <yanjun.zhu@...ux.dev> wrote:
> The warnings are as below:
>
> "
>
> drivers/net/virtio_net.c: In function ‘init_vqs’:
> drivers/net/virtio_net.c:4551:48: warning: ‘%d’ directive writing
> between 1 and 11 bytes into a region of size 10 [-Wformat-overflow=]
>   4551 |                 sprintf(vi->rq[i].name, "input.%d", i);
>        |                                                ^~
> In function ‘virtnet_find_vqs’,
>      inlined from ‘init_vqs’ at drivers/net/virtio_net.c:4645:8:
> drivers/net/virtio_net.c:4551:41: note: directive argument in the range
> [-2147483643, 65534]
>   4551 |                 sprintf(vi->rq[i].name, "input.%d", i);
>        |                                         ^~~~~~~~~~
> drivers/net/virtio_net.c:4551:17: note: ‘sprintf’ output between 8 and
> 18 bytes into a destination of size 16
>   4551 |                 sprintf(vi->rq[i].name, "input.%d", i);
>        |                 ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> drivers/net/virtio_net.c: In function ‘init_vqs’:
> drivers/net/virtio_net.c:4552:49: warning: ‘%d’ directive writing
> between 1 and 11 bytes into a region of size 9 [-Wformat-overflow=]
>   4552 |                 sprintf(vi->sq[i].name, "output.%d", i);
>        |                                                 ^~
> In function ‘virtnet_find_vqs’,
>      inlined from ‘init_vqs’ at drivers/net/virtio_net.c:4645:8:
> drivers/net/virtio_net.c:4552:41: note: directive argument in the range
> [-2147483643, 65534]
>   4552 |                 sprintf(vi->sq[i].name, "output.%d", i);
>        |                                         ^~~~~~~~~~~
> drivers/net/virtio_net.c:4552:17: note: ‘sprintf’ output between 9 and
> 19 bytes into a destination of size 16
>   4552 |                 sprintf(vi->sq[i].name, "output.%d", i);
>
> "
>
> Please review.

Please put this to the git msg.

Reviewed-by: Xuan Zhuo <xuanzhuo@...ux.alibaba.com>

Thanks.



>
> Best Regards,
>
> Zhu Yanjun
>
> 在 2023/12/26 19:45, Zhu Yanjun 写道:
> > From: Zhu Yanjun <yanjun.zhu@...ux.dev>
> >
> > Fix a warning when building virtio_net driver.
> >
> > Signed-off-by: Zhu Yanjun <yanjun.zhu@...ux.dev>
> > ---
> >   drivers/net/virtio_net.c | 5 +++--
> >   1 file changed, 3 insertions(+), 2 deletions(-)
> >
> > diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c
> > index 49625638ad43..cf57eddf768a 100644
> > --- a/drivers/net/virtio_net.c
> > +++ b/drivers/net/virtio_net.c
> > @@ -4508,10 +4508,11 @@ static int virtnet_find_vqs(struct virtnet_info *vi)
> >   {
> >   	vq_callback_t **callbacks;
> >   	struct virtqueue **vqs;
> > -	int ret = -ENOMEM;
> > -	int i, total_vqs;
> >   	const char **names;
> > +	int ret = -ENOMEM;
> > +	int total_vqs;
> >   	bool *ctx;
> > +	u16 i;
> >
> >   	/* We expect 1 RX virtqueue followed by 1 TX virtqueue, followed by
> >   	 * possible N-1 RX/TX queue pairs used in multiqueue mode, followed by