diff options
| author | Prasad J Pandit <pjp@fedoraproject.org> | 2016-02-17 00:23:41 +0530 |
|---|---|---|
| committer | Gerd Hoffmann <kraxel@redhat.com> | 2016-02-23 10:38:01 +0100 |
| commit | fe3c546c5ff2a6210f9a4d8561cc64051ca8603e (patch) | |
| tree | a03737fc0dd0904f6b6afc0b7c07c87064450ca5 /hw/usb | |
| parent | 64c9bc181fc78275596649f591302d72df2d3071 (diff) | |
usb: check RNDIS buffer offsets & length
When processing remote NDIS control message packets,
the USB Net device emulator uses a fixed length(4096) data buffer.
The incoming informationBufferOffset & Length combination could
overflow and cross that range. Check control message buffer
offsets and length to avoid it.
Reported-by: Qinghao Tang <luodalongde@gmail.com>
Signed-off-by: Prasad J Pandit <pjp@fedoraproject.org>
Message-id: 1455648821-17340-3-git-send-email-ppandit@redhat.com
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Diffstat (limited to 'hw/usb')
| -rw-r--r-- | hw/usb/dev-network.c | 9 |
1 files changed, 6 insertions, 3 deletions
diff --git a/hw/usb/dev-network.c b/hw/usb/dev-network.c index 5dc45383d3..c6abd38c2a 100644 --- a/hw/usb/dev-network.c +++ b/hw/usb/dev-network.c @@ -916,8 +916,9 @@ static int rndis_query_response(USBNetState *s, bufoffs = le32_to_cpu(buf->InformationBufferOffset) + 8; buflen = le32_to_cpu(buf->InformationBufferLength); - if (bufoffs + buflen > length) + if (buflen > length || bufoffs >= length || bufoffs + buflen > length) { return USB_RET_STALL; + } infobuflen = ndis_query(s, le32_to_cpu(buf->OID), bufoffs + (uint8_t *) buf, buflen, infobuf, @@ -962,8 +963,9 @@ static int rndis_set_response(USBNetState *s, bufoffs = le32_to_cpu(buf->InformationBufferOffset) + 8; buflen = le32_to_cpu(buf->InformationBufferLength); - if (bufoffs + buflen > length) + if (buflen > length || bufoffs >= length || bufoffs + buflen > length) { return USB_RET_STALL; + } ret = ndis_set(s, le32_to_cpu(buf->OID), bufoffs + (uint8_t *) buf, buflen); @@ -1213,8 +1215,9 @@ static void usb_net_handle_dataout(USBNetState *s, USBPacket *p) if (le32_to_cpu(msg->MessageType) == RNDIS_PACKET_MSG) { uint32_t offs = 8 + le32_to_cpu(msg->DataOffset); uint32_t size = le32_to_cpu(msg->DataLength); - if (offs + size <= len) + if (offs < len && size < len && offs + size <= len) { qemu_send_packet(qemu_get_queue(s->nic), s->out_buf + offs, size); + } } s->out_ptr -= len; memmove(s->out_buf, &s->out_buf[len], s->out_ptr); |