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Tue, 27 Oct 2026 10:50:07 +0000 (UTC) Content-Type: text/plain; charset="utf-8" X-Mailing-List: netdev@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Subject: Re: [PATCH net v6] net: ipv4: add zero check for snd_cwnd_clamp From: patchwork-bot+netdevbpf@kernel.org Message-Id: <179309820631.3724916.7962338860107889277.git-patchwork-notify@kernel.org> Date: Tue, 27 Oct 2026 10:50:06 +0000 References: <20261021235732.1313305-2-kj2864@nyu.edu> In-Reply-To: <20261021235732.1313305-2-kj2864@nyu.edu> To: Jerry Jiang Cc: ncardwell@google.com, kuniyu@google.com, davem@davemloft.net, kuba@kernel.org, pabeni@redhat.com, horms@kernel.org, edumazet@google.com, netdev@vger.kernel.org, linux-kernel@vger.kernel.org, co+71b6509cb791e531@bugs.sh, stable@vger.kernel.org, edumazet@kernel.org Hello: This patch was applied to netdev/net.git (main) by Paolo Abeni : On Wed, 21 Oct 2026 19:57:33 -0400 you wrote: > When RTAX_CWND is locked, user is able to pass 0 into it. > This could lead to writing 0 to tp->snd_cwnd, leading to a > division by zero error. > > Oops: divide error: 0000 [#1] SMP KASAN NOPTI > Call Trace: > > tcp_reno_cong_avoid (net/ipv4/tcp_cong.c:510 (discriminator 1)) > tcp_ack (net/ipv4/tcp_input.c:3517 net/ipv4/tcp_input.c:3873 net/ipv4/tcp_input.c:4440) > tcp_rcv_established (net/ipv4/tcp_input.c:6685) > tcp_v4_do_rcv (net/ipv4/tcp_ipv4.c:1854) > tcp_v4_rcv (net/ipv4/tcp_ipv4.c:2248) > ip_protocol_deliver_rcu (net/ipv4/ip_input.c:207 (discriminator 1)) > ip_local_deliver_finish (net/ipv4/ip_input.c:241 (discriminator 1)) > ip_local_deliver (./include/linux/netfilter.h:325 ./include/linux/netfilter.h:319 net/ipv4/ip_input.c:262) > ip_rcv (./include/net/dst.h:481 (discriminator 6) net/ipv4/ip_input.c:492 (discriminator 6) ./include/linux/netfilter.h:325 (discriminator 6) ./include/li) > __netif_receive_skb_one_core (net/core/dev.c:6297 (discriminator 4)) > __netif_receive_skb (net/core/dev.c:6410) > process_backlog (net/core/dev.c:6761) > __napi_poll.constprop.0 (net/core/dev.c:7830) > net_rx_action (net/core/dev.c:7893 net/core/dev.c:8050) > handle_softirqs (kernel/softirq.c:645) > __irq_exit_rcu (kernel/softirq.c:679 kernel/softirq.c:519 kernel/softirq.c:758) > irq_exit_rcu (kernel/softirq.c:775) > sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1062 (discriminator 35) arch/x86/kernel/apic/apic.c:1062 (discriminator 35)) > RIP: 0010:tcp_cong_avoid_ai (net/ipv4/tcp_cong.c:482) > > [...] Here is the summary with links: - [net,v6] net: ipv4: add zero check for snd_cwnd_clamp https://git.kernel.org/netdev/net/c/363c8c79220d You are awesome, thank you! -- Deet-doot-dot, I am a bot. https://korg.docs.kernel.org/patchwork/pwbot.html