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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>
This commit is contained in:
Prasad J Pandit 2016-02-17 00:23:40 +05:30 committed by Gerd Hoffmann
parent 14ec7b2c5b
commit 64c9bc181f
1 changed files with 9 additions and 9 deletions
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18
hw/usb/core.c
View File

@ -129,9 +129,16 @@ 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];
@ -152,13 +159,6 @@ 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
@ -177,7 +177,7 @@ 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)) {