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Wed, 3 Jun 2026 09:22:17 +0000 Message-ID: <492d7d3a-b4d1-4117-a0db-df75b2d13823@windriver.com> Date: Wed, 3 Jun 2026 17:22:09 +0800 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH] flow_dissector: fix uninit-value in __skb_flow_dissect() for ETH_ADDRS To: Jiayuan Chen , Eric Dumazet Cc: davem@davemloft.net, kuba@kernel.org, pabeni@redhat.com, horms@kernel.org, netdev@vger.kernel.org, linux-kernel@vger.kernel.org References: <20260603030810.3593625-1-yun.zhou@windriver.com> <2fe4890d-842b-4595-b0db-6859579ca6ef@windriver.com> Content-Language: en-US From: "Zhou, Yun" In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit X-ClientProxiedBy: SI2PR02CA0054.apcprd02.prod.outlook.com (2603:1096:4:196::13) To CH0PR11MB5332.namprd11.prod.outlook.com (2603:10b6:610:bf::17) Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-PublicTrafficType: Email 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> > On 6/3/26 4:33 PM, Eric Dumazet wrote: >> On Wed, Jun 3, 2026 at 1:16 AM Zhou, Yun wrote: >>> >>> >>> On 6/3/26 13:44, Eric Dumazet wrote: >>>> CAUTION: This email comes from a non Wind River email account! >>>> Do not click links or open attachments unless you recognize the >>>> sender and know the content is safe. >>>> >>>> On Tue, Jun 2, 2026 at 8:08 PM Yun Zhou >>>> wrote: >>>> Please add a Closes: tag >>> I will add a Closes link in v2. >>> Closes: https://syzkaller.appspot.com/bug?extid=fa2f5b1fb06147be5e16 >>>> I found some not relevant syzbot report : >>>> >>>> https://lore.kernel.org/netdev/6a196faf.c16d89a8.217f2c.0002.GAE@google.com/ >>>> >>> This should be the same issue. And it can be reproduced by >>> https://syzkaller.appspot.com/text?tag=ReproC&x=12924152580000 >> Please investigate which device allowed to send an Ethernet packet >> smaller than the ethernet header. >> >> We do not want to add tests all over the places, we should fix the >> origin. >> >> Look for dev->min_header_len >> >> Thanks. > > > It's TUN. > > I think we should reject loading "tc filter ... flower eth_dst > aa:bb:cc:dd:ee:ff ... " if dev->hard_header_len < > sizeof(flow_dissector_key_eth_addrs) > I will add checks in fl_change() Thanks very much for your suggestion.