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authorJohannes Berg <johannes.berg@intel.com>2014-01-23 16:20:29 +0100
committerJohannes Berg <johannes.berg@intel.com>2014-02-04 21:58:07 +0100
commitd8ca16db6bb23d03fcb794df44bae64ae976f27c (patch)
treef577a829374c0f9daba8bf70e1ea3d6ac107089c /net/mac80211/rx.c
parentae811e21df28deb4c2adab0a47fc3da4f56d777b (diff)
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>
Diffstat (limited to 'net/mac80211/rx.c')
-rw-r--r--net/mac80211/rx.c13
1 files changed, 6 insertions, 7 deletions
diff --git a/net/mac80211/rx.c b/net/mac80211/rx.c
index c24ca0d0f469..3b7a750ebc70 100644
--- a/net/mac80211/rx.c
+++ b/net/mac80211/rx.c
@@ -599,10 +599,10 @@ static int ieee80211_is_unicast_robust_mgmt_frame(struct sk_buff *skb)
{
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 @@ static int ieee80211_is_multicast_robust_mgmt_frame(struct sk_buff *skb)
{
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 @@ static int ieee80211_get_mmie_keyidx(struct sk_buff *skb)
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 @@ static int ieee80211_drop_unencrypted_mgmt(struct ieee80211_rx_data *rx)
* 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;
}