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Date: Wed, 27 Dec 2023 22:41:07 +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 v2 1/1] virtio_net: Fix "‘%d’ directive writing between 1 and 11 bytes into a region of size 10" warnings


在 2023/12/27 22:26, Zhu Yanjun 写道:
> From: Zhu Yanjun <yanjun.zhu@...ux.dev>
>
> Fix the warnings when building virtio_net driver.
>
> "
> 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);
>
> "

Hi, all

V1->V2: Add commit logs. Format string is changed.

Best Regards,

Zhu Yanjun

> Reviewed-by: Xuan Zhuo <xuanzhuo@...ux.alibaba.com>
> Signed-off-by: Zhu Yanjun <yanjun.zhu@...ux.dev>
> ---
>   drivers/net/virtio_net.c | 9 +++++----
>   1 file changed, 5 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c
> index d16f592c2061..89a15cc81396 100644
> --- a/drivers/net/virtio_net.c
> +++ b/drivers/net/virtio_net.c
> @@ -4096,10 +4096,11 @@ 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
> @@ -4136,8 +4137,8 @@ static int virtnet_find_vqs(struct virtnet_info *vi)
>   	for (i = 0; i < vi->max_queue_pairs; i++) {
>   		callbacks[rxq2vq(i)] = skb_recv_done;
>   		callbacks[txq2vq(i)] = skb_xmit_done;
> -		sprintf(vi->rq[i].name, "input.%d", i);
> -		sprintf(vi->sq[i].name, "output.%d", i);
> +		sprintf(vi->rq[i].name, "input.%u", i);
> +		sprintf(vi->sq[i].name, "output.%u", i);
>   		names[rxq2vq(i)] = vi->rq[i].name;
>   		names[txq2vq(i)] = vi->sq[i].name;
>   		if (ctx)

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