netdev - Re: [PATCH net-next v3] ipv6: Fix signed integer overflow in __ip6_append

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Date:   Wed, 1 Jun 2022 14:21:52 +0800
From:   wangyufen <wangyufen@...wei.com>
To:     Jakub Kicinski <kuba@...nel.org>
CC:     <davem@...emloft.net>, <yoshfuji@...ux-ipv6.org>,
        <dsahern@...nel.org>, <edumazet@...gle.com>, <pabeni@...hat.com>,
        <ast@...nel.org>, <daniel@...earbox.net>, <andrii@...nel.org>,
        <kafai@...com>, <songliubraving@...com>, <yhs@...com>,
        <john.fastabend@...il.com>, <kpsingh@...nel.org>,
        <netdev@...r.kernel.org>, <bpf@...r.kernel.org>
Subject: Re: [PATCH net-next v3] ipv6: Fix signed integer overflow in
 __ip6_append_data


在 2022/6/1 12:35, Jakub Kicinski 写道:
> On Sat, 28 May 2022 10:23:12 +0800 Wang Yufen wrote:
>> diff --git a/net/ipv6/udp.c b/net/ipv6/udp.c
>> index 55afd7f39c04..91704bbc7715 100644
>> --- a/net/ipv6/udp.c
>> +++ b/net/ipv6/udp.c
>> @@ -1308,7 +1308,7 @@ int udpv6_sendmsg(struct sock *sk, struct msghdr *msg, size_t len)
>>   	struct ipcm6_cookie ipc6;
>>   	int addr_len = msg->msg_namelen;
>>   	bool connected = false;
>> -	int ulen = len;
>> +	size_t ulen = len;
>>   	int corkreq = READ_ONCE(up->corkflag) || msg->msg_flags&MSG_MORE;
>>   	int err;
>>   	int is_udplite = IS_UDPLITE(sk);
> No need to change ulen neither, it will not overflow and will be
> promoted to size_t when passed to ip6_append_data() / ip6_make_skb().
> .
OK, thanks.