spi: spidev_test: check error

Check the result of sscanf to verify a result was found.
report and error and abort if pattern was not found.

Signed-off-by: Joshua Clayton <stillcompiling@gmail.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

1 files changed, 5 insertions, 1 deletions

diff --git a/tools/spi/spidev_test.c b/tools/spi/spidev_test.c
index 02fc3a44901b..322370dbc770 100644
--- a/tools/spi/spidev_test.c
+++ b/tools/spi/spidev_test.c
@@ -86,13 +86,17 @@ static void hex_dump(const void *src, size_t length, size_t line_size, char *pre
 static int unescape(char *_dst, char *_src, size_t len)
 {
         int ret = 0;
+        int match;
         char *src = _src;
         char *dst = _dst;
         unsigned int ch;
 
         while (*src) {
                 if (*src == '\\' && *(src+1) == 'x') {
-                        sscanf(src + 2, "%2x", &ch);
+                        match = sscanf(src + 2, "%2x", &ch);
+                        if (!match)
+                                pabort("malformed input string");
+
                         src += 4;
                         *dst++ = (unsigned char)ch;
                 } else {