From: Matti Vaittinen <mazziesaccount@xxxxxxxxx>
commit 72b2aa38191bcba28389b0e20bf6b4f15017ff2b upstream.
The iio_utils uses a digit calculation in order to know length of the
file name containing a buffer number. The digit calculation does not
work for number 0.
This leads to allocation of one character too small buffer for the
file-name when file name contains value '0'. (Eg. buffer0).
Fix digit calculation by returning one digit to be present for number
'0'.
Fixes: 096f9b862e60 ("tools:iio:iio_utils: implement digit calculation")
Signed-off-by: Matti Vaittinen <mazziesaccount@xxxxxxxxx>
Link: https://lore.kernel.org/r/Y0f+tKCz+ZAIoroQ@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
Cc: <Stable@xxxxxxxxxxxxxxx>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
tools/iio/iio_utils.c | 4 ++++
1 file changed, 4 insertions(+)
--- a/tools/iio/iio_utils.c
+++ b/tools/iio/iio_utils.c
@@ -543,6 +543,10 @@ static int calc_digits(int num)
{
int count = 0;
+ /* It takes a digit to represent zero */
+ if (!num)
+ return 1;
+
while (num != 0) {
num /= 10;
count++;
