diff options
| author | Johannes Berg <johannes.berg@intel.com> | 2012-10-25 21:51:59 +0200 |
|---|---|---|
| committer | Johannes Berg <johannes.berg@intel.com> | 2012-10-26 22:52:41 +0200 |
| commit | 7dd111e8ee10cc6816669eabcad3334447673236 (patch) | |
| tree | 5fa3735180c86601d8f5805e72e0a3752cdb1a43 | |
| parent | badecb001a310408d3473b1fc2ed5aefd0bc92a9 (diff) | |
| download | lwn-7dd111e8ee10cc6816669eabcad3334447673236.tar.gz lwn-7dd111e8ee10cc6816669eabcad3334447673236.zip | |
wireless: drop invalid mesh address extension frames
The mesh header can have address extension by a 4th
or a 5th and 6th address, but never both. Drop such
frames in 802.11 -> 802.3 conversion along with any
frames that have the wrong extension.
Cc: stable@vger.kernel.org
Reviewed-by: Javier Cardona <javier@cozybit.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
| -rw-r--r-- | net/wireless/util.c | 11 |
1 files changed, 6 insertions, 5 deletions
diff --git a/net/wireless/util.c b/net/wireless/util.c index ef35f4ef2aa6..45a09de1ffe3 100644 --- a/net/wireless/util.c +++ b/net/wireless/util.c @@ -312,18 +312,15 @@ EXPORT_SYMBOL(ieee80211_get_hdrlen_from_skb); static int ieee80211_get_mesh_hdrlen(struct ieee80211s_hdr *meshhdr) { int ae = meshhdr->flags & MESH_FLAGS_AE; - /* 7.1.3.5a.2 */ + /* 802.11-2012, 8.2.4.7.3 */ switch (ae) { + default: case 0: return 6; case MESH_FLAGS_AE_A4: return 12; case MESH_FLAGS_AE_A5_A6: return 18; - case (MESH_FLAGS_AE_A4 | MESH_FLAGS_AE_A5_A6): - return 24; - default: - return 6; } } @@ -373,6 +370,8 @@ int ieee80211_data_to_8023(struct sk_buff *skb, const u8 *addr, /* 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) + return -1; if (meshdr->flags & MESH_FLAGS_AE_A5_A6) { skb_copy_bits(skb, hdrlen + offsetof(struct ieee80211s_hdr, eaddr1), @@ -397,6 +396,8 @@ int ieee80211_data_to_8023(struct sk_buff *skb, const u8 *addr, /* 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) + return -1; if (meshdr->flags & MESH_FLAGS_AE_A4) skb_copy_bits(skb, hdrlen + offsetof(struct ieee80211s_hdr, eaddr1), |