On 20/02/15 19:52, H Hartley Sweeten wrote:
The {min,max}_scan_divisor values could overflow due to the unsigned int * insigned int calculation. Change the type of the local variable 'convert_divisor' to unsigned long long to avoid the possible overflow.Reported-by: coverity (CID 200653) Signed-off-by: H Hartley Sweeten <hswee...@visionengravers.com> Cc: Ian Abbott <abbo...@mev.co.uk> Cc: Greg Kroah-Hartman <gre...@linuxfoundation.org> --- drivers/staging/comedi/drivers/cb_pcidas64.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/staging/comedi/drivers/cb_pcidas64.c b/drivers/staging/comedi/drivers/cb_pcidas64.c index 5b43e4e..9836c87 100644 --- a/drivers/staging/comedi/drivers/cb_pcidas64.c +++ b/drivers/staging/comedi/drivers/cb_pcidas64.c @@ -2001,7 +2001,8 @@ static unsigned int get_divisor(unsigned int ns, unsigned int flags) static void check_adc_timing(struct comedi_device *dev, struct comedi_cmd *cmd) { const struct pcidas64_board *thisboard = dev->board_ptr; - unsigned int convert_divisor = 0, scan_divisor; + unsigned long long convert_divisor = 0; + unsigned int scan_divisor; static const int min_convert_divisor = 3; static const int max_convert_divisor = max_counter_value + min_convert_divisor; @@ -2027,7 +2028,6 @@ static void check_adc_timing(struct comedi_device *dev, struct comedi_cmd *cmd) if (cmd->scan_begin_src == TRIG_TIMER) { scan_divisor = get_divisor(cmd->scan_begin_arg, cmd->flags); if (cmd->convert_src == TRIG_TIMER) { - /* XXX check for integer overflows */ min_scan_divisor = convert_divisor * cmd->chanlist_len; max_scan_divisor = (convert_divisor * cmd->chanlist_len - 1) +
Reviewed-by: Ian Abbott <abbo...@mev.co.uk> -- -=( Ian Abbott @ MEV Ltd. E-mail: <abbo...@mev.co.uk> )=- -=( Web: http://www.mev.co.uk/ )=- _______________________________________________ devel mailing list de...@linuxdriverproject.org http://driverdev.linuxdriverproject.org/mailman/listinfo/driverdev-devel
