[PATCH v3 1/1] virtio_net: Fix "‘%d’ directive writing between 1 and 11 bytes into a region of size 10" warnings

[PATCH v3 1/1] virtio_net: Fix "‘%d’ directive writing between 1 and 11 bytes into a region of size 10" warnings

[Zhu Yanjun]

From: Zhu Yanjun <yanjun.zhu@linux.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);

"

Reviewed-by: Xuan Zhuo <xuanzhuo@linux.alibaba.com>
Signed-off-by: Zhu Yanjun <yanjun.zhu@linux.dev>
---
v2 -> v3: Follow Jakub Kicinski's advice, repost it
v1 -> v2: Add commit logs. Format string is changed.
---
 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)
-- 
2.27.0

Re: [PATCH v3 1/1] virtio_net: Fix "‘%d’ directive writing between 1 and 11 bytes into a region of size 10" warnings

[patchwork-bot+netdevbpf]

Hello:

This patch was applied to netdev/net.git (main)
by Jakub Kicinski <kuba@kernel.org>:

On Thu,  4 Jan 2024 10:09:02 +0800 you wrote:
> From: Zhu Yanjun <yanjun.zhu@linux.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);
> 
> [...]

Here is the summary with links:
  - [v3,1/1] virtio_net: Fix "‘%d’ directive writing between 1 and 11 bytes into a region of size 10" warnings
    https://git.kernel.org/netdev/net/c/e3fe8d28c67b

You are awesome, thank you!
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