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USB: serial: io_ti: fix NULL-deref in interrupt callback

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Fix a NULL-pointer dereference in the interrupt callback should a
malicious device send data containing a bad port number by adding the
missing sanity check.

Fixes: 1da177e4c3 ("Linux-2.6.12-rc2")
Cc: stable <stable@vger.kernel.org>
Signed-off-by: Johan Hovold <johan@kernel.org>
This commit is contained in:
Johan Hovold 2017-03-06 17:36:37 +01:00
parent 2e46565cf6
commit 0b1d250afb
1 changed files with 6 additions and 0 deletions
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6
drivers/usb/serial/io_ti.c
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@ -1674,6 +1674,12 @@ static void edge_interrupt_callback(struct urb *urb)
function = TIUMP_GET_FUNC_FROM_CODE(data[0]); function = TIUMP_GET_FUNC_FROM_CODE(data[0]);
dev_dbg(dev, "%s - port_number %d, function %d, info 0x%x\n", __func__, dev_dbg(dev, "%s - port_number %d, function %d, info 0x%x\n", __func__,
port_number, function, data[1]); port_number, function, data[1]);
if (port_number >= edge_serial->serial->num_ports) {
dev_err(dev, "bad port number %d\n", port_number);
goto exit;
}
port = edge_serial->serial->port[port_number]; port = edge_serial->serial->port[port_number];
edge_port = usb_get_serial_port_data(port); edge_port = usb_get_serial_port_data(port);
if (!edge_port) { if (!edge_port) {