Re: [PATCH 1/1] net:tipc: check return value of pskb_trim()

[Kuniyuki Iwashima <kuniyu@amazon.com>]

From: Yuanjun Gong <ruc_gongyuanjun@163.com>
Date: Mon, 17 Jul 2023 22:50:49 +0800
> goto free_skb if an unexpected result is returned by pskb_tirm()
> in tipc_crypto_rcv_complete().
> 
> Signed-off-by: Yuanjun Gong <ruc_gongyuanjun@163.com>
> ---
>  net/tipc/crypto.c | 5 ++++-
>  1 file changed, 4 insertions(+), 1 deletion(-)
> 
> diff --git a/net/tipc/crypto.c b/net/tipc/crypto.c
> index 577fa5af33ec..1b86cea261a5 100644
> --- a/net/tipc/crypto.c
> +++ b/net/tipc/crypto.c
> @@ -1894,6 +1894,7 @@ static void tipc_crypto_rcv_complete(struct net *net, struct tipc_aead *aead,
>  	struct tipc_aead *tmp = NULL;
>  	struct tipc_ehdr *ehdr;
>  	struct tipc_node *n;
> +	int ret;
>  
>  	/* Is this completed by TX? */
>  	if (unlikely(is_tx(aead->crypto))) {
> @@ -1960,7 +1961,9 @@ static void tipc_crypto_rcv_complete(struct net *net, struct tipc_aead *aead,
>  
>  	skb_reset_network_header(*skb);
>  	skb_pull(*skb, tipc_ehdr_size(ehdr));
> -	pskb_trim(*skb, (*skb)->len - aead->authsize);
> +	ret = pskb_trim(*skb, (*skb)->len - aead->authsize);
> +	if (ret)

No need to define ret.


> +		goto free_skb;
>  
>  	/* Validate TIPCv2 message */
>  	if (unlikely(!tipc_msg_validate(skb))) {
> -- 
> 2.17.1