usb: ccid: check ccid apdu length
CCID device emulator uses Application Protocol Data Units(APDU) to exchange command and responses to and from the host. The length in these units couldn't be greater than 65536. Add check to ensure the same. It'd also avoid potential integer overflow in emulated_apdu_from_guest. Reported-by: Li Qiang <liqiang6-s@360.cn> Signed-off-by: Prasad J Pandit <pjp@fedoraproject.org> Message-id: 20170202192228.10847-1-ppandit@redhat.com Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
This commit is contained in:
parent
96d87bdda3
commit
c7dfbf3225
|
@ -967,7 +967,7 @@ static void ccid_on_apdu_from_guest(USBCCIDState *s, CCID_XferBlock *recv)
|
|||
DPRINTF(s, 1, "%s: seq %d, len %d\n", __func__,
|
||||
recv->hdr.bSeq, len);
|
||||
ccid_add_pending_answer(s, (CCID_Header *)recv);
|
||||
if (s->card) {
|
||||
if (s->card && len <= BULK_OUT_DATA_SIZE) {
|
||||
ccid_card_apdu_from_guest(s->card, recv->abData, len);
|
||||
} else {
|
||||
DPRINTF(s, D_WARN, "warning: discarded apdu\n");
|
||||
|
|
Loading…
Reference in a new issue