[PATCH 4.4 037/118] iio:core: fix IIO_VAL_FRACTIONAL sign handling

From: Greg Kroah-Hartman
Date: Thu Sep 22 2016 - 15:26:49 EST

4.4-stable review patch. If anyone has any objections, please let me know.


From: Gregor Boirie <gregor.boirie@xxxxxxxxxx>

commit 171c0091837c81ed5c949fec6966bb5afff2d1cf upstream.

7985e7c100 ("iio: Introduce a new fractional value type") introduced a
new IIO_VAL_FRACTIONAL value type meant to represent rational type numbers
expressed by a numerator and denominator combination.

Formating of IIO_VAL_FRACTIONAL values relies upon do_div() usage. This
fails handling negative values properly since parameters are reevaluated
as unsigned values.
Fix this by using div_s64_rem() instead. Computed integer part will carry
properly signed value. Formatted fractional part will always be positive.

Fixes: 7985e7c100 ("iio: Introduce a new fractional value type")
Signed-off-by: Gregor Boirie <gregor.boirie@xxxxxxxxxx>
Reviewed-by: Lars-Peter Clausen <lars@xxxxxxxxxx>
Signed-off-by: Jonathan Cameron <jic23@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

drivers/iio/industrialio-core.c | 5 ++---
1 file changed, 2 insertions(+), 3 deletions(-)

--- a/drivers/iio/industrialio-core.c
+++ b/drivers/iio/industrialio-core.c
@@ -447,9 +447,8 @@ ssize_t iio_format_value(char *buf, unsi
return sprintf(buf, "%d.%09u\n", vals[0], vals[1]);
tmp = div_s64((s64)vals[0] * 1000000000LL, vals[1]);
- vals[1] = do_div(tmp, 1000000000LL);
- vals[0] = tmp;
- return sprintf(buf, "%d.%09u\n", vals[0], vals[1]);
+ vals[0] = (int)div_s64_rem(tmp, 1000000000, &vals[1]);
+ return sprintf(buf, "%d.%09u\n", vals[0], abs(vals[1]));
tmp = (s64)vals[0] * 1000000000LL >> vals[1];
vals[1] = do_div(tmp, 1000000000LL);