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Fri, 06 Nov 2026 09:14:44 -0800 (PST) Received: from localhost.localdomain ([90.95.39.175]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-4b571f46489sm148071985e9.3.2026.11.06.09.14.43 (version=TLS1_3 cipher=TLS_CHACHA20_POLY1305_SHA256 bits=256/256); Fri, 06 Nov 2026 09:14:44 -0800 (PST) From: Florin Badita-Nistor To: netdev@vger.kernel.org Cc: edumazet@kernel.org, ncardwell@google.com, kuniyu@google.com, davem@davemloft.net, kuba@kernel.org, pabeni@redhat.com, horms@kernel.org, shuah@kernel.org, linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org Subject: [PATCH net-next v2 0/2] tcp: fix false exhaustion of odd-sized bind port ranges Date: Fri, 6 Nov 2026 19:14:40 +0200 Message-ID: <20261106171442.31811-1-baditaflorin@gmail.com> X-Mailer: git-send-email 2.51.0 X-Mailing-List: linux-kernel@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 Fix false bind() exhaustion when an odd-sized local port range still contains an eligible free port. The wrap can flip parity in odd-sized ranges; even-sized scan sequences are unchanged. The namespace-wide connect() allocator is not changed by this series. Earlier x86-64 KVM validation of this unchanged allocator/test code: - Regression test: four failures before, zero after (eight cases). - Full port-range suite: four failures before, zero after (80 cases); two existing SCTP XPASS results unchanged. - Go net.Listen, 100 attempts per IP version: 100 failures before, zero after; explicit free-port controls succeed in both kernels. Changes in v2: - Target net-next and drop the stable Cc, as requested by Eric. - Document parity changes on odd wraps and scope the fix to bind(). - Shorten the cover letter. v1: https://lore.kernel.org/netdev/CADnh+D0zSzAyYCLo5cXU56o9X-P3RG3N2ix7ARPrP95d8sBXmg@mail.gmail.com/ Florin Badita-Nistor (2): tcp: avoid false bind exhaustion with odd-sized port ranges selftests/net: cover odd-sized local port ranges with one free port net/ipv4/inet_connection_sock.c | 2 - .../selftests/net/ip_local_port_range.c | 67 ++++++++++++++++++- 2 files changed, 64 insertions(+), 5 deletions(-) base-commit: bb67589c87249c9bc2415ab11a754d6e303774e3 -- 2.51.0