Johan Hovold edc5466254 serial: 8250: fix racy uartclk update ... commit 211cde4f5817dc88ef7f8f2fa286e57fbf14c8ee upstream. Commit 868f3ee6e4 ("serial: 8250: Add 8250 port clock update method") added a hack to support SoCs where the UART reference clock can change behind the back of the driver but failed to add the proper locking. First, make sure to take a reference to the tty struct to avoid dereferencing a NULL pointer if the clock change races with a hangup. Second, the termios semaphore must be held during the update to prevent a racing termios change. Fixes: 868f3ee6e4 ("serial: 8250: Add 8250 port clock update method") Fixes: c8dff3aa82 ("serial: 8250: Skip uninitialized TTY port baud rate update") Cc: stable@vger.kernel.org # 5.9 Cc: Serge Semin <Sergey.Semin@baikalelectronics.ru> Tested-by: Serge Semin <fancer.lancer@gmail.com> Reviewed-by: Serge Semin <fancer.lancer@gmail.com> Acked-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Signed-off-by: Johan Hovold <johan@kernel.org> Link: https://lore.kernel.org/r/20211015111422.1027-2-johan@kernel.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		2021-11-18 14:03:51 +01:00
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hvc	hvsi: don't panic on tty_register_driver failure	2021-09-18 13:40:22 +02:00
ipwireless	…
serdev	…
serial	serial: 8250: fix racy uartclk update	2021-11-18 14:03:51 +01:00
vt	tty: Fix out-of-bound vmalloc access in imageblit	2021-10-06 15:55:45 +02:00
Kconfig	…
Makefile	…
amiserial.c	…
cyclades.c	…
ehv_bytechan.c	…
goldfish.c	…
isicom.c	…
mips_ejtag_fdc.c	…
moxa.c	…
moxa.h	…
mxser.c	…
mxser.h	…
n_gsm.c	…
n_hdlc.c	…
n_null.c	…
n_r3964.c	…
n_tracerouter.c	…
n_tracesink.c	…
n_tracesink.h	…
n_tty.c	…
nozomi.c	tty: nozomi: Fix the error handling path of 'nozomi_card_init()'	2021-07-14 16:56:39 +02:00
pty.c	…
rocket.c	…
rocket.h	…
rocket_int.h	…
synclink.c	…
synclink_gt.c	tty: synclink_gt: rename a conflicting function name	2021-09-30 10:11:03 +02:00
synclinkmp.c	…
sysrq.c	…
tty_audit.c	…
tty_baudrate.c	…
tty_buffer.c	…
tty_io.c	tty: Fix data race between tiocsti() and flush_to_ldisc()	2021-09-15 09:50:47 +02:00
tty_ioctl.c	…
tty_jobctrl.c	…
tty_ldisc.c	…
tty_ldsem.c	…
tty_mutex.c	…
tty_port.c	…
ttynull.c	…
vcc.c	…