Date: Tue, 15 Jan 2019 02:05:51 +0000 (UTC) From: Andriy Voskoboinyk <avos@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-stable@freebsd.org, svn-src-stable-12@freebsd.org Subject: svn commit: r343033 - stable/12/sys/net80211 Message-ID: <201901150205.x0F25pbK058119@repo.freebsd.org>
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Author: avos Date: Tue Jan 15 02:05:51 2019 New Revision: 343033 URL: https://svnweb.freebsd.org/changeset/base/343033 Log: MFC r342966: net80211: fix possible panic for some drivers after r342463 Check if rate control structures were allocated before trying to access them in various places; this was possible before on allocation failure (unlikely), but was revealed after r342211 where allocation was deferred. In case if driver uses wlan_amrr(4) and it is loaded it is possible to reproduce the panic via sysctl net.wlan.<number>.rate_stats (for wlan0 the number will be 0). Modified: stable/12/sys/net80211/ieee80211_amrr.c stable/12/sys/net80211/ieee80211_rssadapt.c Directory Properties: stable/12/ (props changed) Modified: stable/12/sys/net80211/ieee80211_amrr.c ============================================================================== --- stable/12/sys/net80211/ieee80211_amrr.c Tue Jan 15 01:57:46 2019 (r343032) +++ stable/12/sys/net80211/ieee80211_amrr.c Tue Jan 15 02:05:51 2019 (r343033) @@ -104,6 +104,9 @@ amrr_setinterval(const struct ieee80211vap *vap, int m struct ieee80211_amrr *amrr = vap->iv_rs; int t; + if (!amrr) + return; + if (msecs < 100) msecs = 100; t = msecs_to_ticks(msecs); @@ -166,6 +169,12 @@ amrr_node_init(struct ieee80211_node *ni) struct ieee80211_amrr_node *amn; uint8_t rate; + if (!amrr) { + if_printf(vap->iv_ifp, "ratectl structure was not allocated, " + "per-node structure allocation skipped\n"); + return; + } + if (ni->ni_rctls == NULL) { ni->ni_rctls = amn = IEEE80211_MALLOC(sizeof(struct ieee80211_amrr_node), M_80211_RATECTL, IEEE80211_M_NOWAIT | IEEE80211_M_ZERO); @@ -327,10 +336,19 @@ static int amrr_rate(struct ieee80211_node *ni, void *arg __unused, uint32_t iarg __unused) { struct ieee80211_amrr_node *amn = ni->ni_rctls; - struct ieee80211_amrr *amrr = amn->amn_amrr; + struct ieee80211_amrr *amrr; const struct ieee80211_rateset *rs = NULL; int rix; + /* XXX should return -1 here, but drivers may not expect this... */ + if (!amn) + { + ni->ni_txrate = ni->ni_rates.rs_rates[0]; + return 0; + } + + amrr = amn->amn_amrr; + /* 11n or not? Pick the right rateset */ if (amrr_node_is_11n(ni)) { /* XXX ew */ @@ -369,6 +387,9 @@ amrr_tx_complete(const struct ieee80211_node *ni, struct ieee80211_amrr_node *amn = ni->ni_rctls; int retries; + if (!amn) + return; + retries = 0; if (status->flags & IEEE80211_RATECTL_STATUS_LONG_RETRY) retries = status->long_retries; @@ -386,6 +407,9 @@ amrr_tx_update_cb(void *arg, struct ieee80211_node *ni struct ieee80211_amrr_node *amn = ni->ni_rctls; int txcnt, success, retrycnt; + if (!amn) + return; + txcnt = stats->nframes; success = stats->nsuccess; retrycnt = 0; @@ -420,9 +444,12 @@ amrr_sysctl_interval(SYSCTL_HANDLER_ARGS) { struct ieee80211vap *vap = arg1; struct ieee80211_amrr *amrr = vap->iv_rs; - int msecs = ticks_to_msecs(amrr->amrr_interval); - int error; + int msecs, error; + if (!amrr) + return ENOMEM; + + msecs = ticks_to_msecs(amrr->amrr_interval); error = sysctl_handle_int(oidp, &msecs, 0, req); if (error || !req->newptr) return error; @@ -436,6 +463,9 @@ amrr_sysctlattach(struct ieee80211vap *vap, { struct ieee80211_amrr *amrr = vap->iv_rs; + if (!amrr) + return; + SYSCTL_ADD_PROC(ctx, SYSCTL_CHILDREN(tree), OID_AUTO, "amrr_rate_interval", CTLTYPE_INT | CTLFLAG_RW, vap, 0, amrr_sysctl_interval, "I", "amrr operation interval (ms)"); @@ -456,6 +486,9 @@ amrr_node_stats(struct ieee80211_node *ni, struct sbuf struct ieee80211_rateset *rs; /* XXX TODO: check locking? */ + + if (!amn) + return; /* XXX TODO: this should be a method */ if (amrr_node_is_11n(ni)) { Modified: stable/12/sys/net80211/ieee80211_rssadapt.c ============================================================================== --- stable/12/sys/net80211/ieee80211_rssadapt.c Tue Jan 15 01:57:46 2019 (r343032) +++ stable/12/sys/net80211/ieee80211_rssadapt.c Tue Jan 15 02:05:51 2019 (r343033) @@ -119,6 +119,9 @@ rssadapt_setinterval(const struct ieee80211vap *vap, i struct ieee80211_rssadapt *rs = vap->iv_rs; int t; + if (!rs) + return; + if (msecs < 100) msecs = 100; t = msecs_to_ticks(msecs); @@ -177,6 +180,12 @@ rssadapt_node_init(struct ieee80211_node *ni) struct ieee80211_rssadapt *rsa = vap->iv_rs; const struct ieee80211_rateset *rs = &ni->ni_rates; + if (!rsa) { + if_printf(vap->iv_ifp, "ratectl structure was not allocated, " + "per-node structure allocation skipped\n"); + return; + } + if (ni->ni_rctls == NULL) { ni->ni_rctls = ra = IEEE80211_MALLOC(sizeof(struct ieee80211_rssadapt_node), @@ -231,10 +240,18 @@ rssadapt_rate(struct ieee80211_node *ni, void *arg __u { struct ieee80211_rssadapt_node *ra = ni->ni_rctls; u_int pktlen = iarg; - const struct ieee80211_rateset *rs = &ra->ra_rates; + const struct ieee80211_rateset *rs; uint16_t (*thrs)[IEEE80211_RATE_SIZE]; int rix, rssi; + /* XXX should return -1 here, but drivers may not expect this... */ + if (!ra) + { + ni->ni_txrate = ni->ni_rates.rs_rates[0]; + return 0; + } + + rs = &ra->ra_rates; if ((ticks - ra->ra_ticks) > ra->ra_rs->interval) { rssadapt_updatestats(ra); ra->ra_ticks = ticks; @@ -320,6 +337,9 @@ rssadapt_tx_complete(const struct ieee80211_node *ni, struct ieee80211_rssadapt_node *ra = ni->ni_rctls; int pktlen, rssi; + if (!ra) + return; + if ((status->flags & (IEEE80211_RATECTL_STATUS_PKTLEN|IEEE80211_RATECTL_STATUS_RSSI)) != (IEEE80211_RATECTL_STATUS_PKTLEN|IEEE80211_RATECTL_STATUS_RSSI)) @@ -344,9 +364,12 @@ rssadapt_sysctl_interval(SYSCTL_HANDLER_ARGS) { struct ieee80211vap *vap = arg1; struct ieee80211_rssadapt *rs = vap->iv_rs; - int msecs = ticks_to_msecs(rs->interval); - int error; + int msecs, error; + if (!rs) + return ENOMEM; + + msecs = ticks_to_msecs(rs->interval); error = sysctl_handle_int(oidp, &msecs, 0, req); if (error || !req->newptr) return error;
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