[PATCH v6 0/3] serial: fix IRQ chain race, baud fallback, and uartclk overflow

[Hui Peng <benquike@gmail.com>]

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