IIO: Documentation: generic_buffer example: Avoid NULL pointer dereference

In case optarg n is not given return/exit

Signed-off-by: Michael Hennerich <michael.hennerich@analog.com>
Acked-by: Jonathan Cameron <jic23@cam.ac.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/drivers/staging/iio/Documentation/generic_buffer.c b/drivers/staging/iio/Documentation/generic_buffer.c
index 771b236..3cc18ab 100644 (file)
--- a/drivers/staging/iio/Documentation/generic_buffer.c
+++ b/drivers/staging/iio/Documentation/generic_buffer.c
@@ -168,6 +168,9 @@ int main(int argc, char **argv)
                }
        }
 
+       if (device_name == NULL)
+               return -1;
+
        /* Find the device requested */
        dev_num = find_type_by_name(device_name, "device");
        if (dev_num < 0) {