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[78.154.15.142]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-48722c9f58fsm121003165e9.11.2026.03.26.23.38.00 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 26 Mar 2026 23:38:00 -0700 (PDT) Message-ID: <4b0ce6be-1f9e-4f2d-b2db-16d39c8b133e@blackwall.org> Date: Fri, 27 Mar 2026 08:37:59 +0200 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH net 2/3] bridge: br_nd_send: validate ND option lengths To: Yang Yang , davem@davemloft.net, edumazet@google.com, kuba@kernel.org, pabeni@redhat.com, idosch@nvidia.com Cc: andrew+netdev@lunn.ch, horms@kernel.org, florian.fainelli@broadcom.com, roopa@cumulusnetworks.com, dlstevens@us.ibm.com, nb@tipi-net.de, netdev@vger.kernel.org, bridge@lists.linux.dev, linux-kernel@vger.kernel.org, yifanwucs@gmail.com, tomapufckgml@gmail.com, tanyuan98@outlook.com, bird@lzu.edu.cn References: <20260326034441.2037420-1-n05ec@lzu.edu.cn> <20260326034441.2037420-3-n05ec@lzu.edu.cn> Content-Language: en-US From: Nikolay Aleksandrov In-Reply-To: <20260326034441.2037420-3-n05ec@lzu.edu.cn> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit On 26/03/2026 05:44, Yang Yang wrote: > br_nd_send() walks ND options according to option-provided lengths. > A malformed option can make the parser advance beyond the computed > option span or use a too-short source LLADDR option payload. > > Validate option lengths against the remaining NS option area before > advancing, and only read source LLADDR when the option is large enough > for an Ethernet address. > > Fixes: ed842faeb2bd ("bridge: suppress nd pkts on BR_NEIGH_SUPPRESS ports") > Cc: stable@vger.kernel.org > Reported-by: Yifan Wu > Reported-by: Juefei Pu > Tested-by: Ao Zhou > Co-developed-by: Yuan Tan > Signed-off-by: Yuan Tan > Suggested-by: Xin Liu > Signed-off-by: Yang Yang > --- > net/bridge/br_arp_nd_proxy.c | 6 ++++-- > 1 file changed, 4 insertions(+), 2 deletions(-) > > diff --git a/net/bridge/br_arp_nd_proxy.c b/net/bridge/br_arp_nd_proxy.c > index af3d1e33f50b8..6b5595868a39c 100644 > --- a/net/bridge/br_arp_nd_proxy.c > +++ b/net/bridge/br_arp_nd_proxy.c > @@ -288,12 +288,14 @@ static void br_nd_send(struct net_bridge *br, struct net_bridge_port *p, > ns_olen = request->len - (skb_network_offset(request) + > sizeof(struct ipv6hdr)) - sizeof(*ns); > for (i = 0; i < ns_olen - 1; i += (ns->opt[i + 1] << 3)) { > - if (!ns->opt[i + 1]) { > + if (!ns->opt[i + 1] || i + (ns->opt[i + 1] << 3) > ns_olen) { > kfree_skb(reply); > return; > } > if (ns->opt[i] == ND_OPT_SOURCE_LL_ADDR) { > - daddr = ns->opt + i + sizeof(struct nd_opt_hdr); > + if ((ns->opt[i + 1] << 3) >= > + sizeof(struct nd_opt_hdr) + ETH_ALEN) > + daddr = ns->opt + i + sizeof(struct nd_opt_hdr); > break; > } > } Acked-by: Nikolay Aleksandrov