[PATCH 4.9 44/56] nl80211: Check for the required netlink attribute presence

[Greg Kroah-Hartman]

4.9-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Hao Chen <flank3r...@gmail.com>


[ Upstream commit 3ea15452ee85754f70f3b9fa1f23165ef2e77ba7 ]

nl80211_nan_add_func() does not check if the required attribute
NL80211_NAN_FUNC_FOLLOW_UP_DEST is present when processing
NL80211_CMD_ADD_NAN_FUNCTION request. This request can be issued
by users with CAP_NET_ADMIN privilege and may result in NULL dereference
and a system crash. Add a check for the required attribute presence.

Signed-off-by: Hao Chen <flank3r...@gmail.com>
Signed-off-by: Johannes Berg <johannes.b...@intel.com>
Signed-off-by: Sasha Levin <alexander.le...@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>
---
 net/wireless/nl80211.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- a/net/wireless/nl80211.c
+++ b/net/wireless/nl80211.c
@@ -10777,7 +10777,8 @@ static int nl80211_nan_add_func(struct s
                break;
        case NL80211_NAN_FUNC_FOLLOW_UP:
                if (!tb[NL80211_NAN_FUNC_FOLLOW_UP_ID] ||
-                   !tb[NL80211_NAN_FUNC_FOLLOW_UP_REQ_ID]) {
+                   !tb[NL80211_NAN_FUNC_FOLLOW_UP_REQ_ID] ||
+                   !tb[NL80211_NAN_FUNC_FOLLOW_UP_DEST]) {
                        err = -EINVAL;
                        goto out;
                }