From: Matti Vaittinen mazziesaccount@gmail.com
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@gmail.com Link: https://lore.kernel.org/r/Y0f+tKCz+ZAIoroQ@dc75zzyyyyyyyyyyyyycy-3.rev.dnain... Cc: Stable@vger.kernel.org Signed-off-by: Jonathan Cameron Jonathan.Cameron@huawei.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- 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++;