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From 6116e5c19a7623b2543fbd937970da9a6e0e1ce7 Mon Sep 17 00:00:00 2001
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From: Gerd Hoffmann <kraxel@redhat.com>
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Date: Tue, 14 Mar 2017 08:52:55 +0100
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Subject: [PATCH 22/24] usb-ccid: move header size check
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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RH-Author: Gerd Hoffmann <kraxel@redhat.com>
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Message-id: <1489481576-26911-4-git-send-email-kraxel@redhat.com>
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Patchwork-id: 74285
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O-Subject: [RHEL-7.4 qemu-kvm PATCH 3/4] usb-ccid: move header size check
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Bugzilla: 1419818
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RH-Acked-by: Stefan Hajnoczi <stefanha@redhat.com>
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RH-Acked-by: Laurent Vivier <lvivier@redhat.com>
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RH-Acked-by: Miroslav Rezanina <mrezanin@redhat.com>
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Move up header size check, so we can use header fields in sanity checks
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(in followup patches). Also reword the debug message.
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Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
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Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com>
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Message-id: 1487250819-23764-3-git-send-email-kraxel@redhat.com
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(cherry picked from commit 7569c54642e8aa9fa03e250c7c578bd4d3747f00)
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Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>
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---
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hw/usb/dev-smartcard-reader.c | 13 ++++++-------
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1 file changed, 6 insertions(+), 7 deletions(-)
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diff --git a/hw/usb/dev-smartcard-reader.c b/hw/usb/dev-smartcard-reader.c
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index 672a7bf..07d15ba 100644
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--- a/hw/usb/dev-smartcard-reader.c
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+++ b/hw/usb/dev-smartcard-reader.c
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@@ -1001,21 +1001,20 @@ static void ccid_handle_bulk_out(USBCCIDState *s, USBPacket *p)
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if (p->iov.size + s->bulk_out_pos > BULK_OUT_DATA_SIZE) {
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goto err;
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}
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- ccid_header = (CCID_Header *)s->bulk_out_data;
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usb_packet_copy(p, s->bulk_out_data + s->bulk_out_pos, p->iov.size);
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s->bulk_out_pos += p->iov.size;
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+ if (s->bulk_out_pos < 10) {
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+ DPRINTF(s, 1, "%s: header incomplete\n", __func__);
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+ goto err;
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+ }
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+
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+ ccid_header = (CCID_Header *)s->bulk_out_data;
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if (p->iov.size == CCID_MAX_PACKET_SIZE) {
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DPRINTF(s, D_VERBOSE,
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"usb-ccid: bulk_in: expecting more packets (%zd/%d)\n",
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p->iov.size, ccid_header->dwLength);
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return;
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}
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- if (s->bulk_out_pos < 10) {
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- DPRINTF(s, 1,
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- "%s: bad USB_TOKEN_OUT length, should be at least 10 bytes\n",
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- __func__);
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- goto err;
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- }
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DPRINTF(s, D_MORE_INFO, "%s %x %s\n", __func__,
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ccid_header->bMessageType,
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--
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1.8.3.1
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