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serial: ma35d1: Validate console index before assignment

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The console is immediately assigned to the ma35d1 port without
checking its index. This oversight can lead to out-of-bounds
errors when the index falls outside the valid '0' to
MA35_UART_NR range. Such scenario trigges ran error like the
following:

 UBSAN: array-index-out-of-bounds in drivers/tty/serial/ma35d1_serial.c:555:51
 index -1 is out of range for type 'uart_ma35d1_port [17]

Check the index before using it and bail out with a warning.

Fixes: 930cbf92db ("tty: serial: Add Nuvoton ma35d1 serial driver support")
Signed-off-by: Andi Shyti <andi.shyti@kernel.org>
Cc: Jacky Huang <ychuang3@nuvoton.com>
Cc: <stable@vger.kernel.org> # v6.5+
Link: https://lore.kernel.org/r/20231204163804.1331415-2-andi.shyti@kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Andi Shyti 2023-12-04 17:38:03 +01:00 committed by Greg Kroah-Hartman
parent 58ac1b3799
commit f0b9d97a77
1 changed files with 9 additions and 1 deletions
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10
drivers/tty/serial/ma35d1_serial.c
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@ -552,11 +552,19 @@ static void ma35d1serial_console_putchar(struct uart_port *port, unsigned char c
*/
static void ma35d1serial_console_write(struct console *co, const char *s, u32 count)
{
struct uart_ma35d1_port *up = &ma35d1serial_ports[co->index];
struct uart_ma35d1_port *up;
unsigned long flags;
int locked = 1;
u32 ier;
if ((co->index < 0) || (co->index >= MA35_UART_NR)) {
pr_warn("Failed to write on ononsole port %x, out of range\n",
co->index);
return;
}
up = &ma35d1serial_ports[co->index];
if (up->port.sysrq)
locked = 0;
else if (oops_in_progress)