From: Tadeusz Struk <tadeusz.struk@linaro.org>
To: Jakub Kicinski <kuba@kernel.org>
Cc: davem@davemloft.net,
Willem de Bruijn <willemdebruijn.kernel@gmail.com>,
Hideaki YOSHIFUJI <yoshfuji@linux-ipv6.org>,
David Ahern <dsahern@kernel.org>,
Alexei Starovoitov <ast@kernel.org>,
Daniel Borkmann <daniel@iogearbox.net>,
Andrii Nakryiko <andrii@kernel.org>,
Martin KaFai Lau <kafai@fb.com>, Song Liu <songliubraving@fb.com>,
Yonghong Song <yhs@fb.com>,
John Fastabend <john.fastabend@gmail.com>,
KP Singh <kpsingh@kernel.org>,
netdev@vger.kernel.org, bpf@vger.kernel.org,
linux-kernel@vger.kernel.org, stable@vger.kernel.org,
syzbot+e223cf47ec8ae183f2a0@syzkaller.appspotmail.com
Subject: Re: [PATCH v2] net: ipv6: fix skb_over_panic in __ip6_append_data
Date: Thu, 10 Mar 2022 14:42:29 -0800 [thread overview]
Message-ID: <62a9b061-1cf5-dff1-c062-a3961de92dca@linaro.org> (raw)
In-Reply-To: <20220310143011.00c21f53@kicinski-fedora-pc1c0hjn.dhcp.thefacebook.com>
On 3/10/22 14:30, Jakub Kicinski wrote:
>> +
>> + /*
>> + * Check if there is still room for payload
>> + */
> TBH I think the check is self-explanatory. Not worth a banner comment,
> for sure.
Ok
>
>> + if (fragheaderlen >= mtu) {
>> + err = -EMSGSIZE;
>> + kfree_skb(skb);
>> + goto error;
>> + }
> Not sure if Willem prefers this placement, but seems like we can lift
> this check out of the loop, as soon as fragheaderlen and mtu are known.
>
He said to check it before the skb_put() and so I did.
The fragheaderlen is known early, but mtu can be updated inside the loop
by ip6_append_data_mtu() so I'm not sure we can do the check before that.
--
Thanks,
Tadeusz
next prev parent reply other threads:[~2022-03-10 22:42 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-03-08 0:01 [PATCH] net: ipv6: fix invalid alloclen in __ip6_append_data Tadeusz Struk
2022-03-08 2:58 ` David Laight
2022-03-08 15:43 ` Tadeusz Struk
2022-03-08 18:18 ` David Ahern
2022-03-08 19:46 ` Tadeusz Struk
2022-03-09 5:01 ` David Ahern
2022-03-09 21:37 ` Tadeusz Struk
2022-03-10 14:39 ` Willem de Bruijn
2022-03-10 16:06 ` Tadeusz Struk
2022-03-10 17:32 ` Willem de Bruijn
2022-03-10 21:14 ` Tadeusz Struk
2022-03-10 22:13 ` [PATCH v2] net: ipv6: fix skb_over_panic " Tadeusz Struk
2022-03-10 22:18 ` David Laight
2022-03-10 22:30 ` Jakub Kicinski
2022-03-10 22:42 ` Tadeusz Struk [this message]
2022-03-10 22:43 ` Willem de Bruijn
2022-03-10 23:04 ` Tadeusz Struk
2022-03-10 23:05 ` David Laight
2022-03-10 23:25 ` [PATCH v3] " Tadeusz Struk
2022-03-11 1:49 ` Willem de Bruijn
2022-03-11 3:43 ` Tadeusz Struk
2022-03-12 1:40 ` patchwork-bot+netdevbpf
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