mac80211: add length check in ieee80211_is_robust_mgmt_frame()
A few places weren't checking that the frame passed to the
function actually has enough data even though the function
clearly documents it must have a payload byte. Make this
safer by changing the function to take an skb and checking
the length inside. The old version is preserved for now as
the rtl* drivers use it and don't have a correct skb.
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
diff --git a/net/mac80211/rx.c b/net/mac80211/rx.c
index c24ca0d..3b7a750 100644
--- a/net/mac80211/rx.c
+++ b/net/mac80211/rx.c
@@ -599,10 +599,10 @@
{
struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
- if (skb->len < 24 || is_multicast_ether_addr(hdr->addr1))
+ if (is_multicast_ether_addr(hdr->addr1))
return 0;
- return ieee80211_is_robust_mgmt_frame(hdr);
+ return ieee80211_is_robust_mgmt_frame(skb);
}
@@ -610,10 +610,10 @@
{
struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
- if (skb->len < 24 || !is_multicast_ether_addr(hdr->addr1))
+ if (!is_multicast_ether_addr(hdr->addr1))
return 0;
- return ieee80211_is_robust_mgmt_frame(hdr);
+ return ieee80211_is_robust_mgmt_frame(skb);
}
@@ -626,7 +626,7 @@
if (skb->len < 24 + sizeof(*mmie) || !is_multicast_ether_addr(hdr->da))
return -1;
- if (!ieee80211_is_robust_mgmt_frame((struct ieee80211_hdr *) hdr))
+ if (!ieee80211_is_robust_mgmt_frame(skb))
return -1; /* not a robust management frame */
mmie = (struct ieee80211_mmie *)
@@ -1845,8 +1845,7 @@
* having configured keys.
*/
if (unlikely(ieee80211_is_action(fc) && !rx->key &&
- ieee80211_is_robust_mgmt_frame(
- (struct ieee80211_hdr *) rx->skb->data)))
+ ieee80211_is_robust_mgmt_frame(rx->skb)))
return -EACCES;
}
diff --git a/net/mac80211/tx.c b/net/mac80211/tx.c
index bb990ec..07a7f38 100644
--- a/net/mac80211/tx.c
+++ b/net/mac80211/tx.c
@@ -452,8 +452,7 @@
if (sta == NULL || !test_sta_flag(sta, WLAN_STA_MFP))
return 0;
- if (!ieee80211_is_robust_mgmt_frame((struct ieee80211_hdr *)
- skb->data))
+ if (!ieee80211_is_robust_mgmt_frame(skb))
return 0;
return 1;
@@ -567,7 +566,7 @@
tx->key = key;
else if (ieee80211_is_mgmt(hdr->frame_control) &&
is_multicast_ether_addr(hdr->addr1) &&
- ieee80211_is_robust_mgmt_frame(hdr) &&
+ ieee80211_is_robust_mgmt_frame(tx->skb) &&
(key = rcu_dereference(tx->sdata->default_mgmt_key)))
tx->key = key;
else if (is_multicast_ether_addr(hdr->addr1) &&
@@ -582,12 +581,12 @@
tx->key = NULL;
else if (tx->skb->protocol == tx->sdata->control_port_protocol)
tx->key = NULL;
- else if (ieee80211_is_robust_mgmt_frame(hdr) &&
+ else if (ieee80211_is_robust_mgmt_frame(tx->skb) &&
!(ieee80211_is_action(hdr->frame_control) &&
tx->sta && test_sta_flag(tx->sta, WLAN_STA_MFP)))
tx->key = NULL;
else if (ieee80211_is_mgmt(hdr->frame_control) &&
- !ieee80211_is_robust_mgmt_frame(hdr))
+ !ieee80211_is_robust_mgmt_frame(tx->skb))
tx->key = NULL;
else {
I802_DEBUG_INC(tx->local->tx_handlers_drop_unencrypted);
diff --git a/net/mac80211/wpa.c b/net/mac80211/wpa.c
index 4aed45c..b8600e3 100644
--- a/net/mac80211/wpa.c
+++ b/net/mac80211/wpa.c
@@ -494,7 +494,7 @@
hdrlen = ieee80211_hdrlen(hdr->frame_control);
if (!ieee80211_is_data(hdr->frame_control) &&
- !ieee80211_is_robust_mgmt_frame(hdr))
+ !ieee80211_is_robust_mgmt_frame(skb))
return RX_CONTINUE;
data_len = skb->len - hdrlen - IEEE80211_CCMP_HDR_LEN -