| From | Greg Kroah-Hartman <> | Subject | [PATCH 5.4 049/222] USB: serial: io_edgeport: handle unbound ports on URB completion | Date | Wed, 22 Jan 2020 10:27:15 +0100 |
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From: Johan Hovold <johan@kernel.org>
commit e37d1aeda737a20b1846a91a3da3f8b0f00cf690 upstream.
Check for NULL port data in the shared interrupt and bulk completion callbacks to avoid dereferencing a NULL pointer in case a device sends data for a port device which isn't bound to a driver (e.g. due to a malicious device having unexpected endpoints or after an allocation failure on port probe).
Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2") Cc: stable <stable@vger.kernel.org> Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: Johan Hovold <johan@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
--- drivers/usb/serial/io_edgeport.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)
--- a/drivers/usb/serial/io_edgeport.c +++ b/drivers/usb/serial/io_edgeport.c @@ -716,7 +716,7 @@ static void edge_interrupt_callback(stru if (txCredits) { port = edge_serial->serial->port[portNumber]; edge_port = usb_get_serial_port_data(port); - if (edge_port->open) { + if (edge_port && edge_port->open) { spin_lock_irqsave(&edge_port->ep_lock, flags); edge_port->txCredits += txCredits; @@ -1825,7 +1825,7 @@ static void process_rcvd_data(struct edg port = edge_serial->serial->port[ edge_serial->rxPort]; edge_port = usb_get_serial_port_data(port); - if (edge_port->open) { + if (edge_port && edge_port->open) { dev_dbg(dev, "%s - Sending %d bytes to TTY for port %d\n", __func__, rxLen, edge_serial->rxPort);
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