linux-kernel - [PATCH resend 1/2] tty: omap-serial: fix division by zero

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Message-ID: <1411636791-24116-1-git-send-email-frans.klaver@xsens.com>
Date:	Thu, 25 Sep 2014 11:19:51 +0200
From:	Frans Klaver <frans.klaver@...ns.com>
To:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
CC:	<stable@...r.kernel.org>, Frans Klaver <frans.klaver@...ns.com>,
	Jiri Slaby <jslaby@...e.cz>, <linux-serial@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>, <linux-omap@...r.kernel.org>
Subject: [PATCH resend 1/2] tty: omap-serial: fix division by zero

If the chosen baud rate is large enough (e.g. 3.5 megabaud), the
calculated n values in serial_omap_is_baud_mode16() may become 0. This
causes a division by zero when calculating the difference between
calculated and desired baud rates. To prevent this, cap the n13 and n16
values on 1.

Division by zero in kernel.
[<c00132e0>] (unwind_backtrace) from [<c00112ec>] (show_stack+0x10/0x14)
[<c00112ec>] (show_stack) from [<c01ed7bc>] (Ldiv0+0x8/0x10)
[<c01ed7bc>] (Ldiv0) from [<c023805c>] (serial_omap_baud_is_mode16+0x4c/0x68)
[<c023805c>] (serial_omap_baud_is_mode16) from [<c02396b4>] (serial_omap_set_termios+0x90/0x8d8)
[<c02396b4>] (serial_omap_set_termios) from [<c0230a0c>] (uart_change_speed+0xa4/0xa8)
[<c0230a0c>] (uart_change_speed) from [<c0231798>] (uart_set_termios+0xa0/0x1fc)
[<c0231798>] (uart_set_termios) from [<c022bb44>] (tty_set_termios+0x248/0x2c0)
[<c022bb44>] (tty_set_termios) from [<c022c17c>] (set_termios+0x248/0x29c)
[<c022c17c>] (set_termios) from [<c022c3e4>] (tty_mode_ioctl+0x1c8/0x4e8)
[<c022c3e4>] (tty_mode_ioctl) from [<c0227e70>] (tty_ioctl+0xa94/0xb18)
[<c0227e70>] (tty_ioctl) from [<c00cf45c>] (do_vfs_ioctl+0x4a0/0x560)
[<c00cf45c>] (do_vfs_ioctl) from [<c00cf568>] (SyS_ioctl+0x4c/0x74)
[<c00cf568>] (SyS_ioctl) from [<c000e480>] (ret_fast_syscall+0x0/0x30)

Signed-off-by: Frans Klaver <frans.klaver@...ns.com>
---
Resend to add stable@...r.kernel.org to CC. As far as I know, this applies to
v3.9 and up.

Thanks,
Frans

 drivers/tty/serial/omap-serial.c | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

diff --git a/drivers/tty/serial/omap-serial.c b/drivers/tty/serial/omap-serial.c
index d017cec..e454b7c 100644
--- a/drivers/tty/serial/omap-serial.c
+++ b/drivers/tty/serial/omap-serial.c
@@ -254,8 +254,16 @@ serial_omap_baud_is_mode16(struct uart_port *port, unsigned int baud)
 {
 	unsigned int n13 = port->uartclk / (13 * baud);
 	unsigned int n16 = port->uartclk / (16 * baud);
-	int baudAbsDiff13 = baud - (port->uartclk / (13 * n13));
-	int baudAbsDiff16 = baud - (port->uartclk / (16 * n16));
+	int baudAbsDiff13;
+	int baudAbsDiff16;
+
+	if (n13 == 0)
+		n13 = 1;
+	if (n16 == 0)
+		n16 = 1;
+
+	baudAbsDiff13 = baud - (port->uartclk / (13 * n13));
+	baudAbsDiff16 = baud - (port->uartclk / (16 * n16));
 	if (baudAbsDiff13 < 0)
 		baudAbsDiff13 = -baudAbsDiff13;
 	if (baudAbsDiff16 < 0)
-- 
2.1.0

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