File 0152-usb-ccid-check-ccid-apdu-length.patch of Package qemu-linux-user.4930

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File 0152-usb-ccid-check-ccid-apdu-length.patch of Package qemu-linux-user.4930

From 487f1a5cc4604ffa89b131d755e070d9842f3b12 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 af4b851356..fc32b00363 100644
--- a/hw/usb/dev-smartcard-reader.c
+++ b/hw/usb/dev-smartcard-reader.c
@@ -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");

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File 0152-usb-ccid-check-ccid-apdu-length.patch of Package qemu-linux-user.4930

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