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[34.82.187.25]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-88725881fa6sm376732b3a.27.2026.09.30.00.48.52 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 30 Sep 2026 00:48:52 -0700 (PDT) From: Hui Peng To: Greg Kroah-Hartman , Jiri Slaby , John Ogness , =?UTF-8?q?Ilpo=20J=C3=A4rvinen?= Cc: Andy Shevchenko , linux-serial@vger.kernel.org, linux-kernel@vger.kernel.org, stable@vger.kernel.org, Hui Peng Subject: [PATCH v6 0/3] serial: fix IRQ chain race, baud fallback, and uartclk overflow Date: Wed, 30 Sep 2026 07:48:47 +0000 Message-ID: <20260930074850.465003-1-benquike@gmail.com> X-Mailer: git-send-email 2.56.0.rc1.315.gc6ed9934b7-goog Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit This series addresses three concurrency and integer overflow issues in the serial driver core and 8250 driver: 1. Fix a mutex vs spinlock deadlock in serial8250_register_ports() during IRQ chain setup. 2. Fix baud rate fallback in uart_get_baud_rate() when custom divisor is in use. 3. Replace manual baud_base overflow check in uart_set_info() with check_mul_overflow(new_info->baud_base, 16, &uartclk), preventing 32-bit unsigned arithmetic wraparound. All 3 patches have been ported to the latest tip of mainline (551c722f4080) and dynamically verified in QEMU KVM with CONFIG_KASAN=y. Changes in v6: - Use check_mul_overflow() in patch 3/3 as suggested by Jiri Slaby. Hui Peng (3): serial: 8250: fix deadlock in serial8250_register_ports() serial: core: fix baud rate fallback in uart_get_baud_rate() serial: core: reject baud_base values that overflow port->uartclk in uart_set_info() drivers/tty/serial/8250/8250_core.c | 4 ++-- drivers/tty/serial/serial_core.c | 12 +++++++++--- 2 files changed, 11 insertions(+), 5 deletions(-) -- 2.47.3