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-rw-r--r--net/wireless/util.c25
1 files changed, 19 insertions, 6 deletions
diff --git a/net/wireless/util.c b/net/wireless/util.c
index be2ab8c..3416373 100644
--- a/net/wireless/util.c
+++ b/net/wireless/util.c
@@ -5,6 +5,7 @@
*/
#include <linux/bitops.h>
#include <linux/etherdevice.h>
+#include <linux/slab.h>
#include <net/cfg80211.h>
#include <net/ip.h>
#include "core.h"
@@ -330,11 +331,18 @@ int ieee80211_data_to_8023(struct sk_buff *skb, const u8 *addr,
if (iftype == NL80211_IFTYPE_MESH_POINT) {
struct ieee80211s_hdr *meshdr =
(struct ieee80211s_hdr *) (skb->data + hdrlen);
- hdrlen += ieee80211_get_mesh_hdrlen(meshdr);
+ /* make sure meshdr->flags is on the linear part */
+ if (!pskb_may_pull(skb, hdrlen + 1))
+ return -1;
if (meshdr->flags & MESH_FLAGS_AE_A5_A6) {
- memcpy(dst, meshdr->eaddr1, ETH_ALEN);
- memcpy(src, meshdr->eaddr2, ETH_ALEN);
+ skb_copy_bits(skb, hdrlen +
+ offsetof(struct ieee80211s_hdr, eaddr1),
+ dst, ETH_ALEN);
+ skb_copy_bits(skb, hdrlen +
+ offsetof(struct ieee80211s_hdr, eaddr2),
+ src, ETH_ALEN);
}
+ hdrlen += ieee80211_get_mesh_hdrlen(meshdr);
}
break;
case cpu_to_le16(IEEE80211_FCTL_FROMDS):
@@ -346,9 +354,14 @@ int ieee80211_data_to_8023(struct sk_buff *skb, const u8 *addr,
if (iftype == NL80211_IFTYPE_MESH_POINT) {
struct ieee80211s_hdr *meshdr =
(struct ieee80211s_hdr *) (skb->data + hdrlen);
- hdrlen += ieee80211_get_mesh_hdrlen(meshdr);
+ /* make sure meshdr->flags is on the linear part */
+ if (!pskb_may_pull(skb, hdrlen + 1))
+ return -1;
if (meshdr->flags & MESH_FLAGS_AE_A4)
- memcpy(src, meshdr->eaddr1, ETH_ALEN);
+ skb_copy_bits(skb, hdrlen +
+ offsetof(struct ieee80211s_hdr, eaddr1),
+ src, ETH_ALEN);
+ hdrlen += ieee80211_get_mesh_hdrlen(meshdr);
}
break;
case cpu_to_le16(0):
@@ -357,7 +370,7 @@ int ieee80211_data_to_8023(struct sk_buff *skb, const u8 *addr,
break;
}
- if (unlikely(skb->len - hdrlen < 8))
+ if (!pskb_may_pull(skb, hdrlen + 8))
return -1;
payload = skb->data + hdrlen;
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