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

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Message-ID: <20140925102451.GF22872@ci00147.xsens-tech.local>
Date:	Thu, 25 Sep 2014 12:24:51 +0200
From:	Frans Klaver <frans.klaver@...ns.com>
To:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
CC:	<stable@...r.kernel.org>, Jiri Slaby <jslaby@...e.cz>,
	<linux-serial@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<linux-omap@...r.kernel.org>
Subject: Re: [PATCH resend 1/2] tty: omap-serial: fix division by zero

On Thu, Sep 25, 2014 at 12:16:28PM +0200, Greg Kroah-Hartman wrote:
> On Thu, Sep 25, 2014 at 11:19:51AM +0200, Frans Klaver wrote:
> > 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.
> 
> <formletter>
> 
> This is not the correct way to submit patches for inclusion in the
> stable kernel tree.  Please read Documentation/stable_kernel_rules.txt
> for how to do this properly.
> 
> </formletter>
> 
> I'll take care of this, but go read that file for your next time...

Ah, right. I'll heed that next time. Thanks for taking care of it.

Frans
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