File 0309-usb-ccid-check-ccid-apdu-length.patch of Package qemu.7445

Overview Repositories Revisions Requests Users Attributes Meta

File 0309-usb-ccid-check-ccid-apdu-length.patch of Package qemu.7445

From cc701f0c05a5895d7f3d19d0cef78ea4ff909387 Mon Sep 17 00:00:00 2001
From: Prasad J Pandit <pjp@fedoraproject.org>
Date: Fri, 3 Feb 2017 00:52:28 +0530
Subject: [PATCH] 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>
(cherry picked from commit c7dfbf322595ded4e70b626bf83158a9f3807c6a)
[BR: CVE-2017-5898 BSC#1023907]
Signed-off-by: Bruce Rogers <brogers@suse.com>
---
 hw/usb/dev-smartcard-reader.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/hw/usb/dev-smartcard-reader.c b/hw/usb/dev-smartcard-reader.c
index 470e69ffc8..945aa0bbf9 100644
--- a/hw/usb/dev-smartcard-reader.c
+++ b/hw/usb/dev-smartcard-reader.c
@@ -962,7 +962,7 @@ 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");

Places

File 0309-usb-ccid-check-ccid-apdu-length.patch of Package qemu.7445

Places