From: Johannes Berg <johannes.berg@intel.com>
Date: Mon, 18 Sep 2017 20:46:36 +0000 (+0200)
Subject: nl80211: fix null-ptr dereference on invalid mesh configuration
X-Git-Tag: v4.14-rc2~10^2~33^2
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=265698d7e6132a2d41471135534f4f36ad15b09c;p=platform%2Fkernel%2Flinux-exynos.git

nl80211: fix null-ptr dereference on invalid mesh configuration

If TX rates are specified during mesh join, the channel must
also be specified. Check the channel pointer to avoid a null
pointer dereference if it isn't.

Reported-by: Jouni Malinen <j@w1.fi>
Fixes: 8564e38206de ("cfg80211: add checks for beacon rate, extend to mesh")
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
---

diff --git a/net/wireless/nl80211.c b/net/wireless/nl80211.c
index fbd5593..6908742 100644
--- a/net/wireless/nl80211.c
+++ b/net/wireless/nl80211.c
@@ -9987,6 +9987,9 @@ static int nl80211_join_mesh(struct sk_buff *skb, struct genl_info *info)
 		if (err)
 			return err;
 
+		if (!setup.chandef.chan)
+			return -EINVAL;
+
 		err = validate_beacon_tx_rate(rdev, setup.chandef.chan->band,
 					      &setup.beacon_rate);
 		if (err)