Commit 2e394bcf authored by Ian Abbott's avatar Ian Abbott Committed by Greg Kroah-Hartman

staging: comedi: dt3000: Fix signed integer overflow 'divider * base'

commit b4d98bc3 upstream.

In `dt3k_ns_to_timer()` the following lines near the end of the function
result in a signed integer overflow:

	prescale = 15;
	base = timer_base * (1 << prescale);
	divider = 65535;
	*nanosec = divider * base;

(`divider`, `base` and `prescale` are type `int`, `timer_base` and
`*nanosec` are type `unsigned int`.  The value of `timer_base` will be
either 50 or 100.)

The main reason for the overflow is that the calculation for `base` is
completely wrong.  It should be:

	base = timer_base * (prescale + 1);

which matches an earlier instance of this calculation in the same
function.
Reported-by: default avatarDavid Binderman <dcb314@hotmail.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: default avatarIan Abbott <abbotti@mev.co.uk>
Link: https://lore.kernel.org/r/20190812111517.26803-1-abbotti@mev.co.ukSigned-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 8c7053d1
......@@ -368,7 +368,7 @@ static int dt3k_ns_to_timer(unsigned int timer_base, unsigned int *nanosec,
}
prescale = 15;
base = timer_base * (1 << prescale);
base = timer_base * (prescale + 1);
divider = 65535;
*nanosec = divider * base;
return (prescale << 16) | (divider);
......
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