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net80211: fix possible panic for some drivers after r342211

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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).

Tested with: RTL8188EE, AP mode + RTL8188CUS, STA mode.

MFC after:	3 days
This commit is contained in:
Andriy Voskoboinyk 2019-01-12 14:57:12 +00:00
parent 31afdd6f10
commit 4367c2d177
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=342966
2 changed files with 62 additions and 6 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

39
sys/net80211/ieee80211_amrr.c
View File

@ -104,6 +104,9 @@ amrr_setinterval(const struct ieee80211vap *vap, int msecs)
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)");
@ -457,6 +487,9 @@ amrr_node_stats(struct ieee80211_node *ni, struct sbuf *s)
/* XXX TODO: check locking? */
if (!amn)
return;
/* XXX TODO: this should be a method */
if (amrr_node_is_11n(ni)) {
rs = (struct ieee80211_rateset *) &ni->ni_htrates;

29
sys/net80211/ieee80211_rssadapt.c
View File

@ -119,6 +119,9 @@ rssadapt_setinterval(const struct ieee80211vap *vap, int msecs)
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 __unused, uint32_t iarg)
{
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;