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Date: Wed, 14 Nov 2012 20:10:28 -0800 From: Greg Kroah-Hartman <gregkh@...uxfoundation.org> To: linux-kernel@...r.kernel.org, stable@...r.kernel.org Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>, alan@...rguk.ukuu.org.uk, Johannes Berg <johannes.berg@...el.com> Subject: [ 23/66] mac80211: check management frame header length 3.6-stable review patch. If anyone has any objections, please let me know. ------------------ From: Johannes Berg <johannes.berg@...el.com> commit 4a4f1a5808c8bb0b72a4f6e5904c53fb8c9cd966 upstream. Due to pskb_may_pull() checking the skb length, all non-management frames are checked on input whether their 802.11 header is fully present. Also add that check for management frames and remove a check that is now duplicate. This prevents accessing skb data beyond the frame end. Signed-off-by: Johannes Berg <johannes.berg@...el.com> Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org> --- net/mac80211/rx.c | 12 ++++++++---- 1 file changed, 8 insertions(+), 4 deletions(-) --- a/net/mac80211/rx.c +++ b/net/mac80211/rx.c @@ -1430,7 +1430,6 @@ ieee80211_rx_h_defragment(struct ieee802 frag = sc & IEEE80211_SCTL_FRAG; if (likely((!ieee80211_has_morefrags(fc) && frag == 0) || - (rx->skb)->len < 24 || is_multicast_ether_addr(hdr->addr1))) { /* not fragmented */ goto out; @@ -2867,10 +2866,15 @@ static void __ieee80211_rx_handle_packet if (ieee80211_is_data(fc) || ieee80211_is_mgmt(fc)) local->dot11ReceivedFragmentCount++; - if (ieee80211_is_mgmt(fc)) - err = skb_linearize(skb); - else + if (ieee80211_is_mgmt(fc)) { + /* drop frame if too short for header */ + if (skb->len < ieee80211_hdrlen(fc)) + err = -ENOBUFS; + else + err = skb_linearize(skb); + } else { err = !pskb_may_pull(skb, ieee80211_hdrlen(fc)); + } if (err) { dev_kfree_skb(skb); -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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