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SubjectRe: [PATCH v3] ping: Check return value of function 'ping_queue_rcv_skb'
On Tue, Jun 08, 2021 at 10:08:53AM +0800, Zheng Yongjun wrote:
> Function 'ping_queue_rcv_skb' not always return success, which will
> also return fail. If not check the wrong return value of it, lead
> to function `ping_rcv` return success.
>
> Signed-off-by: Zheng Yongjun <zhengyongjun3@huawei.com>
> ---
> v2:
> - use rc as return value to make code look cleaner
> v3:
> - delete unnecessary braces {}
> net/ipv4/ping.c | 8 ++++----
> 1 file changed, 4 insertions(+), 4 deletions(-)
>
> diff --git a/net/ipv4/ping.c b/net/ipv4/ping.c
> index 1c9f71a37258..af9da2f7dc85 100644
> --- a/net/ipv4/ping.c
> +++ b/net/ipv4/ping.c
> @@ -963,19 +963,19 @@ bool ping_rcv(struct sk_buff *skb)
> /* Push ICMP header back */
> skb_push(skb, skb->data - (u8 *)icmph);
>
> + bool rc = false;

Declaration of new variables in the middle of function is C++, while the
kernel is written in C. Please put variable declaration at the beginning
of function.

Thanks

> sk = ping_lookup(net, skb, ntohs(icmph->un.echo.id));
> if (sk) {
> struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
>
> pr_debug("rcv on socket %p\n", sk);
> - if (skb2)
> - ping_queue_rcv_skb(sk, skb2);
> + if (skb2 && !ping_queue_rcv_skb(sk, skb2))
> + rc = true;
> sock_put(sk);
> - return true;
> }
> pr_debug("no socket, dropping\n");
>
> - return false;
> + return rc;
> }
> EXPORT_SYMBOL_GPL(ping_rcv);
>
> --
> 2.25.1
>

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