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([2a0d:3344:5521:6b10:58fd:68f:7756:389d]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-496c45c297dsm76861475e9.7.2026.07.28.06.50.02 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 28 Jul 2026 06:50:04 -0700 (PDT) Message-ID: <4b5f67a2-5624-4adb-812a-bd87d99416ed@redhat.com> Date: Tue, 28 Jul 2026 15:50:02 +0200 Precedence: bulk X-Mailing-List: linux-s390@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH net v5 1/3] net/smc: bound the wire-controlled producer cursor to the RMB To: hexlabsecurity@proton.me, Sidraya Jayagond , Jakub Kicinski , "D. Wythe" , "David S. Miller" , Wen Gu , Wenjia Zhang , Eric Dumazet , Tony Lu , Mahanta Jambigi , Dust Li Cc: linux-s390@vger.kernel.org, linux-rdma@vger.kernel.org, Ursula Braun , netdev@vger.kernel.org, linux-kernel@vger.kernel.org, Stefan Raspl , Simon Horman References: <20260723-b4-disp-0d07164f-v5-0-6a9e235dbc4e@proton.me> <20260723-b4-disp-0d07164f-v5-1-6a9e235dbc4e@proton.me> From: Paolo Abeni Content-Language: en-US In-Reply-To: <20260723-b4-disp-0d07164f-v5-1-6a9e235dbc4e@proton.me> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit On 7/24/26 2:23 AM, Bryam Vargas via B4 Relay wrote: > @@ -246,8 +256,13 @@ static inline void smcr_cdc_msg_to_host(struct smc_host_cdc_msg *local, > local->len = peer->len; > local->seqno = ntohs(peer->seqno); > local->token = ntohl(peer->token); > - smc_cdc_cursor_to_host(&local->prod, &peer->prod, conn); > - smc_cdc_cursor_to_host(&local->cons, &peer->cons, conn); > + /* bound the wire-controlled producer cursor to our RMB (used as a raw > + * index by the urgent path); leave the consumer cursor unbounded -- it > + * indexes the peer's RMB and is bounded by peer_rmbe_size. > + */ > + smc_cdc_cursor_to_host(&local->prod, &peer->prod, conn, > + conn->rmb_desc->len); Sashiko gemini suspects the above may cause a Null ptr dereference: https://sashiko.dev/#/patchset/20260723-b4-disp-0d07164f-v5-0-6a9e235dbc4e%40proton.me /P