From: Ola Olsson <ola1olsson@gmail.com>
Date: Wed, 21 Oct 2015 12:02:24 +0000 (+0200)
Subject: iw: Fix segfault when no args are given to offchannel
X-Git-Tag: v4.7~22
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=7082f96ff89fb8a1d05d9fd94fb67ba41a536302;p=thirdparty%2Fiw.git

iw: Fix segfault when no args are given to offchannel

The offchannel command assumes that frequency and duration
are given as arguments, otherwise iw segfaults - fix that
by printing help text instead.

Signed-off-by: Ola Olsson <ola.olsson@sonymobile.com>
[remove braces]
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
---

diff --git a/offch.c b/offch.c
index 49b101a..19e170e 100644
--- a/offch.c
+++ b/offch.c
@@ -15,6 +15,9 @@ static int offchannel(struct nl80211_state *state,
 {
 	char *end;
 
+	if (argc < 2)
+		return 1;
+
 	/* freq */
 	NLA_PUT_U32(msg, NL80211_ATTR_WIPHY_FREQ,
 		    strtoul(argv[0], &end, 10));