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[68.48.65.54]) by smtp.gmail.com with ESMTPSA id af79cd13be357-915721f7d75sm346036285a.18.2026.06.02.06.36.13 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 02 Jun 2026 06:36:14 -0700 (PDT) From: Michael Bommarito To: Jon Maloy , "David S . Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni Cc: Simon Horman , Ying Xue , netdev@vger.kernel.org, tipc-discussion@lists.sourceforge.net, linux-kernel@vger.kernel.org Subject: [PATCH net 4/4] tipc: reject inverted service ranges from peer bindings Date: Tue, 2 Jun 2026 09:35:55 -0400 Message-ID: <20260602133555.769727-5-michael.bommarito@gmail.com> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20260602133555.769727-1-michael.bommarito@gmail.com> References: <20260602133555.769727-1-michael.bommarito@gmail.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 7bit tipc_update_nametbl() inserts a binding advertised by a peer node using the lower and upper service-range bounds taken directly from the wire, without checking that lower <= upper. The local bind path validates the ordering (tipc_uaddr_valid()), but the name-distribution path does not. A binding with lower > upper is inserted at the far end of the service-range rbtree (keyed on lower) where no lookup or withdrawal can ever match it (service_range_foreach_match() requires sr->lower <= end). The publication, its service_range node and the augmented rbtree entry are then leaked for the lifetime of the namespace, and there is no per-peer cap equivalent to TIPC_MAX_PUBL on locally created bindings. Reject inverted ranges in the network path as well. A peer node can otherwise leak unbounded binding-table memory by sending PUBLICATION items with lower > upper. Fixes: 37922ea4a310 ("tipc: permit overlapping service ranges in name table") Assisted-by: Claude:claude-opus-4-7 Signed-off-by: Michael Bommarito --- net/tipc/name_distr.c | 11 ++++++++++- 1 file changed, 10 insertions(+), 1 deletion(-) diff --git a/net/tipc/name_distr.c b/net/tipc/name_distr.c index 190b49c5cbc3e..b4ff074a2babd 100644 --- a/net/tipc/name_distr.c +++ b/net/tipc/name_distr.c @@ -283,9 +283,18 @@ static bool tipc_update_nametbl(struct net *net, struct distr_item *i, struct tipc_socket_addr sk; struct tipc_uaddr ua; u32 key = ntohl(i->key); + u32 lower = ntohl(i->lower); + u32 upper = ntohl(i->upper); + + /* A peer-advertised binding with lower > upper can never be matched + * or withdrawn and would leak the publication; the local bind path + * rejects such ranges, so reject ranges learned from the network too. + */ + if (lower > upper) + return false; tipc_uaddr(&ua, TIPC_SERVICE_RANGE, TIPC_CLUSTER_SCOPE, - ntohl(i->type), ntohl(i->lower), ntohl(i->upper)); + ntohl(i->type), lower, upper); sk.ref = ntohl(i->port); sk.node = node; -- 2.53.0