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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Date: Tue, 26 Dec 2023 19:53:58 +0800
From: Zhu Yanjun <yanjun.zhu@...ux.dev>
To: Zhu Yanjun <yanjun.zhu@...el.com>, mst@...hat.com, jasowang@...hat.com,
 xuanzhuo@...ux.alibaba.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

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.

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