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rum: fix frame length checks in Rx path.

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Split usbd_xfer_status() check:
- Check xfer length: must be longer, than Rx descriptor size.
- Check frame size: must be shorter than xfer length.
- Discard too short frames.

Tested with WUSB54GC, STA/MONITOR modes.
This commit is contained in:
Andriy Voskoboinyk 2016-09-06 06:40:59 +00:00
parent 1a82707cd7
commit c84bb70268
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=305465
1 changed files with 16 additions and 2 deletions
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18
sys/dev/usb/wlan/if_rum.c
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@ -1151,7 +1151,7 @@ rum_bulk_read_callback(struct usb_xfer *xfer, usb_error_t error)
DPRINTFN(15, "rx done, actlen=%d\n", len);
if (len < (int)(RT2573_RX_DESC_SIZE + IEEE80211_MIN_LEN)) {
if (len < RT2573_RX_DESC_SIZE) {
DPRINTF("%s: xfer too short %d\n",
device_get_nameunit(sc->sc_dev), len);
counter_u64_add(ic->ic_ierrors, 1);
@ -1165,6 +1165,20 @@ rum_bulk_read_callback(struct usb_xfer *xfer, usb_error_t error)
rssi = rum_get_rssi(sc, sc->sc_rx_desc.rssi);
flags = le32toh(sc->sc_rx_desc.flags);
sc->last_rx_flags = flags;
if (len < ((flags >> 16) & 0xfff)) {
DPRINTFN(5, "%s: frame is truncated from %d to %d "
"bytes\n", device_get_nameunit(sc->sc_dev),
(flags >> 16) & 0xfff, len);
counter_u64_add(ic->ic_ierrors, 1);
goto tr_setup;
}
len = (flags >> 16) & 0xfff;
if (len < sizeof(struct ieee80211_frame_ack)) {
DPRINTFN(5, "%s: frame too short %d\n",
device_get_nameunit(sc->sc_dev), len);
counter_u64_add(ic->ic_ierrors, 1);
goto tr_setup;
}
if (flags & RT2573_RX_CRC_ERROR) {
/*
* This should not happen since we did not
@ -1210,7 +1224,7 @@ rum_bulk_read_callback(struct usb_xfer *xfer, usb_error_t error)
}
/* finalize mbuf */
m->m_pkthdr.len = m->m_len = (flags >> 16) & 0xfff;
m->m_pkthdr.len = m->m_len = len;
if (ieee80211_radiotap_active(ic)) {
struct rum_rx_radiotap_header *tap = &sc->sc_rxtap;