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Bug fix: in ieee80211_find_txnode, we used to call ieee80211_ref_node(ni) 

if ni == NULL and the operating mode was not "ad hoc" or "ad hoc
demo."  That crashed the kernel.  Now, if the operating mode is
not "ad hoc (demo)," and ni == NULL, return NULL right away.

Also, if ieee80211_dup_bss returns NULL, return NULL right away.
This doesn't fix a bug, but it makes clear how this works.
This commit is contained in:
dyoung 2004-10-04 07:17:41 +00:00
parent 71532e5cb8
commit b01c9a3223
1 changed files with 12 additions and 12 deletions
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16
sys/net80211/ieee80211_node.c
View File

@ -1,4 +1,4 @@
/* $NetBSD: ieee80211_node.c,v 1.34 2004/08/10 21:58:31 dyoung Exp $ */
/* $NetBSD: ieee80211_node.c,v 1.35 2004/10/04 07:17:41 dyoung Exp $ */
/*-
* Copyright (c) 2001 Atsushi Onoe
* Copyright (c) 2002-2004 Sam Leffler, Errno Consulting
@ -35,7 +35,7 @@
#ifdef __FreeBSD__
__FBSDID("$FreeBSD: src/sys/net80211/ieee80211_node.c,v 1.22 2004/04/05 04:15:55 sam Exp $");
#else
__KERNEL_RCSID(0, "$NetBSD: ieee80211_node.c,v 1.34 2004/08/10 21:58:31 dyoung Exp $");
__KERNEL_RCSID(0, "$NetBSD: ieee80211_node.c,v 1.35 2004/10/04 07:17:41 dyoung Exp $");
#endif
#include "opt_inet.h"
@ -615,9 +615,10 @@ ieee80211_find_txnode(struct ieee80211com *ic, u_int8_t *macaddr)
IEEE80211_NODE_LOCK(ic);
ni = _ieee80211_find_node(ic, macaddr);
IEEE80211_NODE_UNLOCK(ic);
if (ni == NULL &&
(ic->ic_opmode == IEEE80211_M_IBSS ||
ic->ic_opmode == IEEE80211_M_AHDEMO)) {
if (ni == NULL) {
if (ic->ic_opmode != IEEE80211_M_IBSS &&
ic->ic_opmode != IEEE80211_M_AHDEMO)
return NULL;
/*
* Fake up a node; this handles node discovery in
* adhoc mode. Note that for the driver's benefit
@ -627,14 +628,13 @@ ieee80211_find_txnode(struct ieee80211com *ic, u_int8_t *macaddr)
* XXX need better way to handle this; issue probe
* request so we can deduce rate set, etc.
*/
ni = ieee80211_dup_bss(ic, macaddr);
if (ni != NULL) {
if ((ni = ieee80211_dup_bss(ic, macaddr)) == NULL)
return NULL;
/* XXX no rate negotiation; just dup */
ni->ni_rates = ic->ic_bss->ni_rates;
if (ic->ic_newassoc)
(*ic->ic_newassoc)(ic, ni, 1);
}
}
return ieee80211_ref_node(ni);
}