tools:iio:iio_utils: check amount of matches

fscanf() usually returns the number of input items successfully matched
and assigned, which can be fewer than provided (or even zero).
Add a check in iioutils_get_type() to make sure all items are matched.

Signed-off-by: Hartmut Knaack <knaack.h@gmx.de>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>

1 files changed, 4 insertions, 0 deletions

diff --git a/tools/iio/iio_utils.c b/tools/iio/iio_utils.c
index f12bc2e81c80..c5b4136e648a 100644
--- a/tools/iio/iio_utils.c
+++ b/tools/iio/iio_utils.c
@@ -144,6 +144,10 @@ int iioutils_get_type(unsigned *is_signed,
                                 ret = -errno;
                                 printf("failed to pass scan type description\n");
                                 goto error_close_sysfsfp;
+                        } else if (ret != 5) {
+                                ret = -EIO;
+                                printf("scan type description didn't match\n");
+                                goto error_close_sysfsfp;
                         }
                         *be = (endianchar == 'b');
                         *bytes = padint / 8;