diff options
author | Prasad J Pandit <pjp@fedoraproject.org> | 2016-02-17 00:23:40 +0530 |
---|---|---|
committer | Michael Roth <mdroth@linux.vnet.ibm.com> | 2016-03-22 17:40:52 -0500 |
commit | 9bddb45dbc010cd8ee4d48bd501fa5d18dcec00c (patch) | |
tree | 4a4904d3314214aac7aa1f1164354db5310d9ce8 | |
parent | e3a2cdfcb5e282139217924044ec5af00c7f8eed (diff) |
usb: check RNDIS message length
When processing remote NDIS control message packets, the USB Net
device emulator uses a fixed length(4096) data buffer. The incoming
packet length could exceed this limit. Add a check to avoid it.
Signed-off-by: Prasad J Pandit <pjp@fedoraproject.org>
Message-id: 1455648821-17340-2-git-send-email-ppandit@redhat.com
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
(cherry picked from commit 64c9bc181fc78275596649f591302d72df2d3071)
Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>
-rw-r--r-- | hw/usb/core.c | 18 |
1 files changed, 9 insertions, 9 deletions
diff --git a/hw/usb/core.c b/hw/usb/core.c index d0025db60d..7f46370295 100644 --- a/hw/usb/core.c +++ b/hw/usb/core.c @@ -128,9 +128,16 @@ static void do_token_setup(USBDevice *s, USBPacket *p) } usb_packet_copy(p, s->setup_buf, p->iov.size); + s->setup_index = 0; p->actual_length = 0; s->setup_len = (s->setup_buf[7] << 8) | s->setup_buf[6]; - s->setup_index = 0; + if (s->setup_len > sizeof(s->data_buf)) { + fprintf(stderr, + "usb_generic_handle_packet: ctrl buffer too small (%d > %zu)\n", + s->setup_len, sizeof(s->data_buf)); + p->status = USB_RET_STALL; + return; + } request = (s->setup_buf[0] << 8) | s->setup_buf[1]; value = (s->setup_buf[3] << 8) | s->setup_buf[2]; @@ -151,13 +158,6 @@ static void do_token_setup(USBDevice *s, USBPacket *p) } s->setup_state = SETUP_STATE_DATA; } else { - if (s->setup_len > sizeof(s->data_buf)) { - fprintf(stderr, - "usb_generic_handle_packet: ctrl buffer too small (%d > %zu)\n", - s->setup_len, sizeof(s->data_buf)); - p->status = USB_RET_STALL; - return; - } if (s->setup_len == 0) s->setup_state = SETUP_STATE_ACK; else @@ -176,7 +176,7 @@ static void do_token_in(USBDevice *s, USBPacket *p) request = (s->setup_buf[0] << 8) | s->setup_buf[1]; value = (s->setup_buf[3] << 8) | s->setup_buf[2]; index = (s->setup_buf[5] << 8) | s->setup_buf[4]; - + switch(s->setup_state) { case SETUP_STATE_ACK: if (!(s->setup_buf[0] & USB_DIR_IN)) { |