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authorJohannes Berg <johannes.berg@intel.com>2012-10-26 02:36:40 +0400
committerJohannes Berg <johannes.berg@intel.com>2012-10-27 00:52:42 +0400
commit9b395bc3be1cebf0144a127c7e67d56dbdac0930 (patch)
tree9cbe0d8566b890f43cd8d9f884f8b78104775f29 /net/wireless
parent4a4f1a5808c8bb0b72a4f6e5904c53fb8c9cd966 (diff)
downloadlinux-9b395bc3be1cebf0144a127c7e67d56dbdac0930.tar.xz
mac80211: verify that skb data is present
A number of places in the mesh code don't check that the frame data is present and in the skb header when trying to access. Add those checks and the necessary pskb_may_pull() calls. This prevents accessing data that doesn't actually exist. To do this, export ieee80211_get_mesh_hdrlen() to be able to use it in mac80211. Cc: stable@vger.kernel.org Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Diffstat (limited to 'net/wireless')
-rw-r--r--net/wireless/util.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/net/wireless/util.c b/net/wireless/util.c
index 45a09de1ffe3..2762e8329986 100644
--- a/net/wireless/util.c
+++ b/net/wireless/util.c
@@ -309,7 +309,7 @@ unsigned int ieee80211_get_hdrlen_from_skb(const struct sk_buff *skb)
}
EXPORT_SYMBOL(ieee80211_get_hdrlen_from_skb);
-static int ieee80211_get_mesh_hdrlen(struct ieee80211s_hdr *meshhdr)
+unsigned int ieee80211_get_mesh_hdrlen(struct ieee80211s_hdr *meshhdr)
{
int ae = meshhdr->flags & MESH_FLAGS_AE;
/* 802.11-2012, 8.2.4.7.3 */
@@ -323,6 +323,7 @@ static int ieee80211_get_mesh_hdrlen(struct ieee80211s_hdr *meshhdr)
return 18;
}
}
+EXPORT_SYMBOL(ieee80211_get_mesh_hdrlen);
int ieee80211_data_to_8023(struct sk_buff *skb, const u8 *addr,
enum nl80211_iftype iftype)