From mboxrd@z Thu Jan 1 00:00:00 1970 Return-path: Received: from s3.sipsolutions.net ([5.9.151.49]:36950 "EHLO sipsolutions.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932196AbdABKYa (ORCPT ); Mon, 2 Jan 2017 05:24:30 -0500 From: Johannes Berg To: linux-wireless@vger.kernel.org Cc: Ben Greear , Johannes Berg Subject: [PATCH] mac80211: initialize fast-xmit 'info' later Date: Mon, 2 Jan 2017 11:24:26 +0100 Message-Id: <20170102102426.15121-1-johannes@sipsolutions.net> (sfid-20170102_112432_877167_E1F796B8) Sender: linux-wireless-owner@vger.kernel.org List-ID: From: Johannes Berg In ieee80211_xmit_fast(), 'info' is initialized to point to the skb that's passed in, but that skb may later be replaced by a clone (if it was shared), leading to an invalid pointer. This can lead to use-after-free and also later crashes since the real SKB's info->hw_queue doesn't get initialized properly. Fix this by assigning info only later, when it's needed, after the skb replacement (may have) happened. Cc: stable@vger.kernel.org Reported-by: Ben Greear Signed-off-by: Johannes Berg --- net/mac80211/tx.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/net/mac80211/tx.c b/net/mac80211/tx.c index 4dea18be385c..3182e0c4e157 100644 --- a/net/mac80211/tx.c +++ b/net/mac80211/tx.c @@ -3288,7 +3288,7 @@ static bool ieee80211_xmit_fast(struct ieee80211_sub_if_data *sdata, int extra_head = fast_tx->hdr_len - (ETH_HLEN - 2); int hw_headroom = sdata->local->hw.extra_tx_headroom; struct ethhdr eth; - struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); + struct ieee80211_tx_info *info; struct ieee80211_hdr *hdr = (void *)fast_tx->hdr; struct ieee80211_tx_data tx; ieee80211_tx_result r; @@ -3352,6 +3352,7 @@ static bool ieee80211_xmit_fast(struct ieee80211_sub_if_data *sdata, memcpy(skb->data + fast_tx->da_offs, eth.h_dest, ETH_ALEN); memcpy(skb->data + fast_tx->sa_offs, eth.h_source, ETH_ALEN); + info = IEEE80211_SKB_CB(skb); memset(info, 0, sizeof(*info)); info->band = fast_tx->band; info->control.vif = &sdata->vif; -- 2.9.3