iw: fix ftm_request missing arguments segfault

When expected argument <config-file> is not passed to arguemts iw
segfaults.

Example: iw wlp2s0 measurement ftm_request

This fixes it.

Signed-off-by: Benjamin Aschenbrenner <benjamin.aschenbrenner@gmail.com>
Link: https://lore.kernel.org/r/20210410111937.32813-2-benjamin.aschenbrenner@gmail.com
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

diff --git a/measurements.c b/measurements.c
index 635d9425a1ee7eab77262ec87107a70db6957718..80fe7853fe9a01a506b9500afc398a1bea9dec64 100644 (file)
--- a/measurements.c
+++ b/measurements.c
@@ -282,6 +282,9 @@ static int handle_ftm_req_send(struct nl80211_state *state, struct nl_msg *msg,
        const char *file;
        int err;
 
+       if (argc < 1)
+               return HANDLER_RET_USAGE;
+
        file = argv[0];
        argc--;
        argv++;