Commit 6aed13b2 authored by Johan Hovold's avatar Johan Hovold Committed by Sasha Levin

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

[ Upstream commit 0b1d250a ]

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: 1da177e4 ("Linux-2.6.12-rc2")
Cc: stable <stable@vger.kernel.org>
Signed-off-by: default avatarJohan Hovold <johan@kernel.org>
Signed-off-by: default avatarSasha Levin <alexander.levin@verizon.com>
parent 92fbcbfe
...@@ -1546,6 +1546,12 @@ static void edge_interrupt_callback(struct urb *urb) ...@@ -1546,6 +1546,12 @@ 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) {
......
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