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Properly range check length of parsed information elements in RSU driver.

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Found by:		Ilja van Sprundel <ivansprundel@ioactive.com>
MFC after:		3 days
Sponsored by:		Mellanox Technologies
This commit is contained in:
Hans Petter Selasky 2017-07-30 16:45:28 +00:00
parent 723a81dec6
commit bd9175e1aa
1 changed files with 16 additions and 8 deletions
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24
sys/dev/usb/wlan/if_rsu.c
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@ -2031,6 +2031,8 @@ rsu_hwrssi_to_rssi(struct rsu_softc *sc, int hw_rssi)
return (v);
}
CTASSERT(MCLBYTES > sizeof(struct ieee80211_frame));
static void
rsu_event_survey(struct rsu_softc *sc, uint8_t *buf, int len)
{
@ -2039,28 +2041,31 @@ rsu_event_survey(struct rsu_softc *sc, uint8_t *buf, int len)
struct ndis_wlan_bssid_ex *bss;
struct ieee80211_rx_stats rxs;
struct mbuf *m;
int pktlen;
uint32_t ieslen;
uint32_t pktlen;
if (__predict_false(len < sizeof(*bss)))
return;
bss = (struct ndis_wlan_bssid_ex *)buf;
if (__predict_false(len < sizeof(*bss) + le32toh(bss->ieslen)))
ieslen = le32toh(bss->ieslen);
/* range check length of information element */
if (__predict_false(ieslen > (uint32_t)(len - sizeof(*bss))))
return;
RSU_DPRINTF(sc, RSU_DEBUG_SCAN,
"%s: found BSS %s: len=%d chan=%d inframode=%d "
"networktype=%d privacy=%d, RSSI=%d\n",
__func__,
ether_sprintf(bss->macaddr), le32toh(bss->len),
ether_sprintf(bss->macaddr), ieslen,
le32toh(bss->config.dsconfig), le32toh(bss->inframode),
le32toh(bss->networktype), le32toh(bss->privacy),
le32toh(bss->rssi));
/* Build a fake beacon frame to let net80211 do all the parsing. */
/* XXX TODO: just call the new scan API methods! */
pktlen = sizeof(*wh) + le32toh(bss->ieslen);
if (__predict_false(pktlen > MCLBYTES))
if (__predict_false(ieslen > (size_t)(MCLBYTES - sizeof(*wh))))
return;
pktlen = sizeof(*wh) + ieslen;
m = m_get2(pktlen, M_NOWAIT, MT_DATA, M_PKTHDR);
if (__predict_false(m == NULL))
return;
@ -2073,7 +2078,7 @@ rsu_event_survey(struct rsu_softc *sc, uint8_t *buf, int len)
IEEE80211_ADDR_COPY(wh->i_addr2, bss->macaddr);
IEEE80211_ADDR_COPY(wh->i_addr3, bss->macaddr);
*(uint16_t *)wh->i_seq = 0;
memcpy(&wh[1], (uint8_t *)&bss[1], le32toh(bss->ieslen));
memcpy(&wh[1], (uint8_t *)&bss[1], ieslen);
/* Finalize mbuf. */
m->m_pkthdr.len = m->m_len = pktlen;
@ -3373,6 +3378,8 @@ rsu_fw_loadsection(struct rsu_softc *sc, const uint8_t *buf, int len)
return (0);
}
CTASSERT(sizeof(size_t) >= sizeof(uint32_t));
static int
rsu_load_firmware(struct rsu_softc *sc)
{
@ -3380,7 +3387,7 @@ rsu_load_firmware(struct rsu_softc *sc)
struct r92s_fw_priv *dmem;
struct ieee80211com *ic = &sc->sc_ic;
const uint8_t *imem, *emem;
int imemsz, ememsz;
uint32_t imemsz, ememsz;
const struct firmware *fw;
size_t size;
uint32_t reg;
@ -3432,7 +3439,8 @@ rsu_load_firmware(struct rsu_softc *sc)
imemsz = le32toh(hdr->imemsz);
ememsz = le32toh(hdr->sramsz);
/* Check that all FW sections fit in image. */
if (size < sizeof(*hdr) + imemsz + ememsz) {
if (imemsz > (size_t)(size - sizeof(*hdr)) ||
ememsz > (size_t)(size - sizeof(*hdr) - imemsz)) {
device_printf(sc->sc_dev, "firmware too short\n");
error = EINVAL;
goto fail;