From 3ea15452ee85754f70f3b9fa1f23165ef2e77ba7 Mon Sep 17 00:00:00 2001 From: Hao Chen Date: Wed, 3 Jan 2018 11:00:31 +0800 Subject: nl80211: Check for the required netlink attribute presence 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 Signed-off-by: Johannes Berg --- net/wireless/nl80211.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) (limited to 'net') diff --git a/net/wireless/nl80211.c b/net/wireless/nl80211.c index 213d0c498c97..2b3dbcd40e46 100644 --- a/net/wireless/nl80211.c +++ b/net/wireless/nl80211.c @@ -11361,7 +11361,8 @@ static int nl80211_nan_add_func(struct sk_buff *skb, 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; } -- cgit v1.2.3 From 736a80bbfda709fb3631f5f62056f250a38e5804 Mon Sep 17 00:00:00 2001 From: Johannes Berg Date: Thu, 4 Jan 2018 15:51:53 +0100 Subject: mac80211: mesh: drop frames appearing to be from us If there are multiple mesh stations with the same MAC address, they will both get confused and start throwing warnings. Obviously in this case nothing can actually work anyway, so just drop frames that look like they're from ourselves early on. Reported-by: Gui Iribarren Signed-off-by: Johannes Berg --- net/mac80211/rx.c | 2 ++ 1 file changed, 2 insertions(+) (limited to 'net') diff --git a/net/mac80211/rx.c b/net/mac80211/rx.c index 70e9d2ca8bbe..4daafb07602f 100644 --- a/net/mac80211/rx.c +++ b/net/mac80211/rx.c @@ -3632,6 +3632,8 @@ static bool ieee80211_accept_frame(struct ieee80211_rx_data *rx) } return true; case NL80211_IFTYPE_MESH_POINT: + if (ether_addr_equal(sdata->vif.addr, hdr->addr2)) + return false; if (multicast) return true; return ether_addr_equal(sdata->vif.addr, hdr->addr1); -- cgit v1.2.3