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openwrt/package/madwifi/patches/451-ibss_race_fix.patch
Felix Fietkau e85f50118c madwifi: fix some potential null pointer derefs with wds 
SVN-Revision: 19322
2010-01-24 23:39:00 +00:00

343 lines
11 KiB
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Raw Blame History

--- a/net80211/ieee80211_input.c
+++ b/net80211/ieee80211_input.c
@@ -294,10 +294,10 @@ ieee80211_input(struct ieee80211vap * va
break;
case IEEE80211_M_IBSS:
case IEEE80211_M_AHDEMO:
- if (!IEEE80211_ADDR_EQ(wh->i_addr3, vap->iv_bssid) ||
+ if ((!IEEE80211_ADDR_EQ(wh->i_addr3, vap->iv_bssid) ||
(!IEEE80211_ADDR_EQ(wh->i_addr1, vap->iv_myaddr) &&
- !IEEE80211_IS_MULTICAST(wh->i_addr1) &&
- (subtype != IEEE80211_FC0_SUBTYPE_BEACON))) {
+ !IEEE80211_IS_MULTICAST(wh->i_addr1))) &&
+ (type == IEEE80211_FC0_TYPE_DATA)) {
if (!(vap->iv_dev->flags & IFF_PROMISC)) {
IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
bssid, NULL, "%s", "not to bss");
@@ -322,22 +322,15 @@ ieee80211_input(struct ieee80211vap * va
}
/* Do not try to find a node reference if the packet really did come from the BSS */
if (type == IEEE80211_FC0_TYPE_DATA && ni == vap->iv_bss &&
- !IEEE80211_ADDR_EQ(vap->iv_bss->ni_macaddr, wh->i_addr2) &&
IEEE80211_ADDR_EQ(vap->iv_bssid, wh->i_addr3)) {
/* Try to find sender in local node table. */
- ni = ieee80211_find_node(&ic->ic_sta, wh->i_addr2);
+ if (!ni_or_null) {
+ ieee80211_unref_node(&ni);
+ ni = ieee80211_find_txnode(vap, wh->i_addr2);
+ }
if (ni == NULL) {
- /*
- * Fake up a node for this newly discovered
- * member of the IBSS. This should probably
- * done after an ACL check.
- */
- ni = ieee80211_fakeup_adhoc_node(vap,
- wh->i_addr2);
- if (ni == NULL) {
- /* NB: stat kept for alloc failure */
- goto err;
- }
+ /* NB: stat kept for alloc failure */
+ goto discard;
}
}
iwspy_event(vap, ni, rssi);
@@ -3553,8 +3546,8 @@ ieee80211_recv_mgmt(struct ieee80211vap
(((vap->iv_opmode == IEEE80211_M_HOSTAP) ||
(vap->iv_opmode == IEEE80211_M_WDS)) &&
(scan.capinfo & IEEE80211_CAPINFO_ESS))) {
+ struct ieee80211_node *tni = NULL;
struct ieee80211vap *avp = NULL;
- int do_unref = 0;
int found = 0;
IEEE80211_LOCK_IRQ(vap->iv_ic);
@@ -3570,14 +3563,12 @@ ieee80211_recv_mgmt(struct ieee80211vap
}
}
if (found)
- ni = ni_or_null = avp->iv_wdsnode;
+ tni = ieee80211_ref_node(avp->iv_wdsnode);
} else if ((vap->iv_opmode == IEEE80211_M_WDS) && vap->iv_wdsnode) {
found = 1;
- ni = ni_or_null = vap->iv_wdsnode;
- } else if (vap->iv_opmode == IEEE80211_M_IBSS) {
- ni_or_null = ieee80211_find_node(&ic->ic_sta, wh->i_addr2);
- if (ni_or_null)
- ni = ni_or_null;
+ tni = ieee80211_ref_node(vap->iv_wdsnode);
+ } else if ((vap->iv_opmode == IEEE80211_M_IBSS) && (vap->iv_state == IEEE80211_S_RUN)) {
+ tni = ieee80211_find_node(&ic->ic_sta, wh->i_addr2);
found = 1;
}
IEEE80211_UNLOCK_IRQ(vap->iv_ic);
@@ -3585,20 +3576,21 @@ ieee80211_recv_mgmt(struct ieee80211vap
if (!found)
break;
- if (ni_or_null == NULL) {
+ memcpy(&SKB_CB(skb)->beacon_tsf, scan.tstamp, sizeof(u_int64_t));
+
+ if (tni == NULL) {
if (avp) {
IEEE80211_LOCK_IRQ(ic);
- ni = ieee80211_add_neighbor(avp, wh, &scan);
+ tni = ieee80211_add_neighbor(avp, wh, &scan);
/* force assoc */
- ni->ni_associd |= 0xc000;
- avp->iv_wdsnode = ieee80211_ref_node(ni);
+ tni->ni_associd |= 0xc000;
+ avp->iv_wdsnode = ieee80211_ref_node(tni);
IEEE80211_UNLOCK_IRQ(ic);
} else if ((vap->iv_opmode == IEEE80211_M_IBSS) &&
IEEE80211_ADDR_EQ(wh->i_addr3, vap->iv_bssid)) {
/* Create a new entry in the neighbor table. */
- ni = ieee80211_add_neighbor(vap, wh, &scan);
+ tni = ieee80211_add_neighbor(vap, wh, &scan);
}
- do_unref = 1;
} else {
/*
* Copy data from beacon to neighbor table.
@@ -3606,39 +3598,38 @@ ieee80211_recv_mgmt(struct ieee80211vap
* ieee80211_add_neighbor(), so we just copy
* everything over to be safe.
*/
- ni->ni_esslen = scan.ssid[1];
- memcpy(ni->ni_essid, scan.ssid + 2, scan.ssid[1]);
- IEEE80211_ADDR_COPY(ni->ni_bssid, wh->i_addr3);
- memcpy(ni->ni_tstamp.data, scan.tstamp,
- sizeof(ni->ni_tstamp));
- ni->ni_inact = ni->ni_inact_reload;
- ni->ni_intval =
+ tni->ni_esslen = scan.ssid[1];
+ memcpy(tni->ni_essid, scan.ssid + 2, scan.ssid[1]);
+ IEEE80211_ADDR_COPY(tni->ni_bssid, wh->i_addr3);
+ memcpy(tni->ni_tstamp.data, scan.tstamp,
+ sizeof(tni->ni_tstamp));
+ tni->ni_inact = tni->ni_inact_reload;
+ tni->ni_intval =
IEEE80211_BINTVAL_SANITISE(scan.bintval);
- ni->ni_capinfo = scan.capinfo;
- ni->ni_chan = ic->ic_curchan;
- ni->ni_fhdwell = scan.fhdwell;
- ni->ni_fhindex = scan.fhindex;
- ni->ni_erp = scan.erp;
- ni->ni_timoff = scan.timoff;
+ tni->ni_capinfo = scan.capinfo;
+ tni->ni_chan = ic->ic_curchan;
+ tni->ni_fhdwell = scan.fhdwell;
+ tni->ni_fhindex = scan.fhindex;
+ tni->ni_erp = scan.erp;
+ tni->ni_timoff = scan.timoff;
if (scan.wme != NULL)
- ieee80211_saveie(&ni->ni_wme_ie, scan.wme);
+ ieee80211_saveie(&tni->ni_wme_ie, scan.wme);
if (scan.wpa != NULL)
- ieee80211_saveie(&ni->ni_wpa_ie, scan.wpa);
+ ieee80211_saveie(&tni->ni_wpa_ie, scan.wpa);
if (scan.rsn != NULL)
- ieee80211_saveie(&ni->ni_rsn_ie, scan.rsn);
+ ieee80211_saveie(&tni->ni_rsn_ie, scan.rsn);
if (scan.ath != NULL)
- ieee80211_saveath(ni, scan.ath);
+ ieee80211_saveath(tni, scan.ath);
/* NB: must be after ni_chan is setup */
- ieee80211_setup_rates(ni, scan.rates,
+ ieee80211_setup_rates(tni, scan.rates,
scan.xrates, IEEE80211_F_DOSORT);
}
- if (ni != NULL) {
- ni->ni_rssi = rssi;
- ni->ni_rtsf = rtsf;
- ni->ni_last_rx = jiffies;
- if (do_unref)
- ieee80211_unref_node(&ni);
+ if (tni != NULL) {
+ tni->ni_rssi = rssi;
+ tni->ni_rtsf = rtsf;
+ tni->ni_last_rx = jiffies;
+ ieee80211_unref_node(&tni);
}
}
break;
--- a/net80211/ieee80211_node.c
+++ b/net80211/ieee80211_node.c
@@ -53,6 +53,7 @@
#include <net80211/ieee80211_var.h>
#include <net80211/if_athproto.h>
+#include <net80211/ieee80211_node.h>
/*
* Association IDs are managed with a bit vector.
@@ -317,16 +318,11 @@ ieee80211_create_ibss(struct ieee80211va
/* Check to see if we already have a node for this mac
* NB: we gain a node reference here
*/
- ni = ieee80211_find_txnode(vap, vap->iv_myaddr);
+ ieee80211_node_table_reset(&ic->ic_sta, vap);
+ ni = ieee80211_alloc_node_table(vap, vap->iv_myaddr);
if (ni == NULL) {
- ni = ieee80211_alloc_node_table(vap, vap->iv_myaddr);
- IEEE80211_DPRINTF(vap, IEEE80211_MSG_ASSOC,
- "%s: ni:%p allocated for " MAC_FMT "\n",
- __func__, ni, MAC_ADDR(vap->iv_myaddr));
- if (ni == NULL) {
- /* XXX recovery? */
- return;
- }
+ /* XXX recovery? */
+ return;
}
IEEE80211_ADDR_COPY(ni->ni_bssid, vap->iv_myaddr);
@@ -647,7 +643,7 @@ ieee80211_sta_join1(struct ieee80211_nod
(vap->iv_state == IEEE80211_S_RUN) && bssid_equal(obss, selbs)); */
vap->iv_bss = selbs;
IEEE80211_ADDR_COPY(vap->iv_bssid, selbs->ni_bssid);
- if (obss != NULL) {
+ if ((obss != NULL) && (obss != selbs)) {
if (obss->ni_table)
ieee80211_node_leave(obss);
ieee80211_unref_node(&obss);
--- a/ath/if_ath.c
+++ b/ath/if_ath.c
@@ -6625,14 +6625,6 @@ ath_recv_mgmt(struct ieee80211vap * vap,
sc->sc_recv_mgmt(vap, ni_or_null, skb, subtype, rssi, rtsf);
- /* Lookup the new node if any (this grabs a reference to it) */
- ni = ieee80211_find_rxnode(vap->iv_ic, vap,
- (const struct ieee80211_frame_min *)skb->data);
- if (ni == NULL) {
- DPRINTF(sc, ATH_DEBUG_BEACON, "Dropping; node unknown.\n");
- return;
- }
-
switch (subtype) {
case IEEE80211_FC0_SUBTYPE_BEACON:
/* update RSSI statistics for use by the HAL */
@@ -6654,11 +6646,9 @@ ath_recv_mgmt(struct ieee80211vap * vap,
* we do the IBSS merging in software. Also do not merge
* if the difference it too small. Otherwise we are playing
* tsf-pingpong with other vendors drivers */
- beacon_tsf = le64_to_cpu(ni->ni_tstamp.tsf);
- if (beacon_tsf > rtsf + 0xffff) {
+ beacon_tsf = le64_to_cpu(SKB_CB(skb)->beacon_tsf);
+ if (beacon_tsf > rtsf + 0xffff)
ath_hal_settsf64(sc->sc_ah, beacon_tsf - rtsf);
- ieee80211_ibss_merge(ni);
- }
break;
}
/* NB: Fall Through */
@@ -6680,13 +6670,21 @@ ath_recv_mgmt(struct ieee80211vap * vap,
hw_tsf = ath_hal_gettsf64(sc->sc_ah);
hw_tu = hw_tsf >> 10;
- beacon_tsf = le64_to_cpu(ni->ni_tstamp.tsf);
+ beacon_tsf = le64_to_cpu(SKB_CB(skb)->beacon_tsf);
beacon_tu = beacon_tsf >> 10;
+ if (!beacon_tsf)
+ break;
+
+ if (IEEE80211_ADDR_EQ(wh->i_addr3, vap->iv_bssid))
+ break;
+
DPRINTF(sc, ATH_DEBUG_BEACON,
- "Beacon transmitted at %10llx, "
+ "Beacon transmitted from "MAC_FMT" ("MAC_FMT") at %10llx, "
"received at %10llx(%lld), hw TSF "
"%10llx(%lld)\n",
+ MAC_ADDR(wh->i_addr3),
+ MAC_ADDR(vap->iv_bssid),
beacon_tsf,
rtsf, rtsf - beacon_tsf,
hw_tsf, hw_tsf - beacon_tsf);
@@ -6699,39 +6697,13 @@ ath_recv_mgmt(struct ieee80211vap * vap,
do_merge = 1;
}
- /* Check sc_nexttbtt */
- if (sc->sc_nexttbtt < hw_tu) {
- DPRINTF(sc, ATH_DEBUG_BEACON,
- "sc_nexttbtt (%8x TU) is in the past "
- "(tsf %8x TU), updating timers\n",
- sc->sc_nexttbtt, hw_tu);
- do_merge = 1;
- }
-
- intval = ni->ni_intval & HAL_BEACON_PERIOD;
-#if 0
- /* This code is disabled since it would produce
- * unwanted merge. For instance, in a two nodes network
- * A & B, A can merge to B and at the same time, B will
- * merge to A, still having a split */
- if (intval != 0) {
- if ((sc->sc_nexttbtt % intval) !=
- (beacon_tu % intval)) {
- DPRINTF(sc, ATH_DEBUG_BEACON,
- "ibss merge: "
- "sc_nexttbtt %10x TU "
- "(%3d) beacon %10x TU "
- "(%3d)\n",
- sc->sc_nexttbtt,
- sc->sc_nexttbtt % intval,
- beacon_tu,
- beacon_tu % intval);
- do_merge = 1;
- }
- }
-#endif
- if (do_merge)
+ if (do_merge) {
+ /* Lookup the new node if any (this grabs a reference to it) */
+ ni = ieee80211_find_txnode(vap, wh->i_addr2);
+ memcpy(ni->ni_bssid, wh->i_addr3, IEEE80211_ADDR_LEN);
ieee80211_ibss_merge(ni);
+ ieee80211_unref_node(&ni);
+ }
if ((sc->sc_opmode == HAL_M_IBSS) &&
ath_hw_check_atim(sc, 1, vap->iv_bss->ni_intval))
@@ -6739,8 +6711,6 @@ ath_recv_mgmt(struct ieee80211vap * vap,
}
break;
}
-
- ieee80211_unref_node(&ni);
}
static void
--- a/net80211/ieee80211_linux.h
+++ b/net80211/ieee80211_linux.h
@@ -411,7 +411,7 @@ typedef spinlock_t acl_lock_t;
* 8 bytes so we reserve/avoid it.
*/
struct ieee80211_cb {
- u_int8_t vlan[8]; /* reserve for vlan tag info */
+ u_int64_t beacon_tsf;
struct ieee80211_node *ni;
u_int32_t flags;
#define M_LINK0 0x01 /* frame needs WEP encryption */
--- a/net80211/ieee80211_scan_sta.c
+++ b/net80211/ieee80211_scan_sta.c
@@ -1125,11 +1125,8 @@ adhoc_default_action(struct ieee80211vap
u_int8_t zeroMacAddr[IEEE80211_ADDR_LEN];
memset(&zeroMacAddr, 0, IEEE80211_ADDR_LEN);
- if (IEEE80211_ADDR_EQ(se->se_bssid, &zeroMacAddr[0])) {
- ieee80211_create_ibss(vap, se->se_chan);
- return 1;
- } else
- return ieee80211_sta_join(vap, se);
+ ieee80211_create_ibss(vap, se->se_chan);
+ return 1;
}
static const struct ieee80211_scanner adhoc_default = {
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