netdev - [PATCH] mac80211_hwsim: require at least one channel

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Date:   Wed, 15 Aug 2018 18:19:59 +0200
From:   Johannes Berg <johannes@...solutions.net>
To:     linux-wireless@...r.kernel.org
Cc:     netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        syzkaller-bugs@...glegroups.com,
        Johannes Berg <johannes.berg@...el.com>
Subject: [PATCH] mac80211_hwsim: require at least one channel

From: Johannes Berg <johannes.berg@...el.com>

Syzbot continues to try to create mac80211_hwsim radios, and
manages to pass parameters that are later checked with WARN_ON
in cfg80211 - catch another one in hwsim directly.

Reported-by: syzbot+2a12f11c306afe871c1f@...kaller.appspotmail.com
Signed-off-by: Johannes Berg <johannes.berg@...el.com>
---
 drivers/net/wireless/mac80211_hwsim.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/net/wireless/mac80211_hwsim.c b/drivers/net/wireless/mac80211_hwsim.c
index 18e819d964f1..fe1b0108f06d 100644
--- a/drivers/net/wireless/mac80211_hwsim.c
+++ b/drivers/net/wireless/mac80211_hwsim.c
@@ -3194,6 +3194,11 @@ static int hwsim_new_radio_nl(struct sk_buff *msg, struct genl_info *info)
 	if (info->attrs[HWSIM_ATTR_CHANNELS])
 		param.channels = nla_get_u32(info->attrs[HWSIM_ATTR_CHANNELS]);
 
+	if (param.channels < 1) {
+		GENL_SET_ERR_MSG(info, "must have at least one channel");
+		return -EINVAL;
+	}
+
 	if (param.channels > CFG80211_MAX_NUM_DIFFERENT_CHANNELS) {
 		GENL_SET_ERR_MSG(info, "too many channels specified");
 		return -EINVAL;
-- 
2.14.4