compat_ioctl use 0xffffffff as a magic number to mark invalid pointer for iomem_base in serial_struct when truncating a 64bit pointer into 32bit. Serial driver need recognize this invalid pointer when parsing serial_struct from userspace. Signed-off-by: Jiang Lu <lu.jiang@xxxxxxxxxxxxx> --- drivers/tty/serial/serial_core.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/tty/serial/serial_core.c b/drivers/tty/serial/serial_core.c index a5d545e..d293536 100644 --- a/drivers/tty/serial/serial_core.c +++ b/drivers/tty/serial/serial_core.c @@ -745,6 +745,9 @@ static int uart_set_info(struct tty_struct *tty, struct tty_port *port, * allocations, we should treat type changes the same as * IO port changes. */ + if ((unsigned long)new_info->iomem_base == 0xffffffff) + new_info->iomem_base = (void *)(unsigned long)uport->mapbase; + change_port = !(uport->flags & UPF_FIXED_PORT) && (new_port != uport->iobase || (unsigned long)new_info->iomem_base != uport->mapbase || -- 1.9.1 -- To unsubscribe from this list: send the line "unsubscribe linux-serial" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
