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mac80211: fix action frame length checks

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The action frame length checks are one too small, there's not just
an action code as the comment makes you believe, there's a category
code too, and the category code is required in each action frame
(hence part of IEEE80211_MIN_ACTION_SIZE).

Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Johannes Berg 2008-09-08 15:41:59 +02:00 committed by John W. Linville
parent 5bda617576
commit 9c80d3dc27
3 changed files with 11 additions and 2 deletions
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4
net/mac80211/mesh_hwmp.c
View File

@ -581,6 +581,10 @@ void mesh_rx_path_sel_frame(struct ieee80211_sub_if_data *sdata,
size_t baselen;
u32 last_hop_metric;
/* need action_code */
if (len < IEEE80211_MIN_ACTION_SIZE + 1)
return;
baselen = (u8 *) mgmt->u.action.u.mesh_action.variable - (u8 *) mgmt;
ieee802_11_parse_elems(mgmt->u.action.u.mesh_action.variable,
len - baselen, &elems);

4
net/mac80211/mesh_plink.c
View File

@ -421,6 +421,10 @@ void mesh_rx_plink_frame(struct ieee80211_sub_if_data *sdata, struct ieee80211_m
DECLARE_MAC_BUF(mac);
#endif
/* need action_code, aux */
if (len < IEEE80211_MIN_ACTION_SIZE + 3)
return;
if (is_multicast_ether_addr(mgmt->da)) {
mpl_dbg("Mesh plink: ignore frame from multicast address");
return;

5
net/mac80211/mlme.c
View File

@ -60,7 +60,7 @@
#define ERP_INFO_USE_PROTECTION BIT(1)
/* mgmt header + 1 byte action code */
/* mgmt header + 1 byte category code */
#define IEEE80211_MIN_ACTION_SIZE (24 + 1)
#define IEEE80211_ADDBA_PARAM_POLICY_MASK 0x0002
@ -2988,7 +2988,8 @@ static void ieee80211_rx_mgmt_action(struct ieee80211_sub_if_data *sdata,
{
struct ieee80211_local *local = sdata->local;
if (len < IEEE80211_MIN_ACTION_SIZE)
/* all categories we currently handle have action_code */
if (len < IEEE80211_MIN_ACTION_SIZE + 1)
return;
switch (mgmt->u.action.category) {