Re: [PATCH 4/5] comedi: vmk80xx: fix bulk-buffer overflow

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On 25/10/2021 12:45, Johan Hovold wrote:
The driver is using endpoint-sized buffers but must not assume that the
tx and rx buffers are of equal size or a malicious device could overflow
the slab-allocated receive buffer when doing bulk transfers.

Fixes: 985cafccbf9b ("Staging: Comedi: vmk80xx: Add k8061 support")
Cc: stable@xxxxxxxxxxxxxxx      # 2.6.31
Signed-off-by: Johan Hovold <johan@xxxxxxxxxx>
---
  drivers/comedi/drivers/vmk80xx.c | 16 +++++++---------
  1 file changed, 7 insertions(+), 9 deletions(-)

diff --git a/drivers/comedi/drivers/vmk80xx.c b/drivers/comedi/drivers/vmk80xx.c
index f2c1572d0cd7..9c56918e3b76 100644
--- a/drivers/comedi/drivers/vmk80xx.c
+++ b/drivers/comedi/drivers/vmk80xx.c
@@ -159,22 +159,20 @@ static void vmk80xx_do_bulk_msg(struct comedi_device *dev)
  	__u8 rx_addr;
  	unsigned int tx_pipe;
  	unsigned int rx_pipe;
-	size_t size;
+	size_t tx_size;
+	size_t rx_size;
tx_addr = devpriv->ep_tx->bEndpointAddress;
  	rx_addr = devpriv->ep_rx->bEndpointAddress;
  	tx_pipe = usb_sndbulkpipe(usb, tx_addr);
  	rx_pipe = usb_rcvbulkpipe(usb, rx_addr);
-
-	/*
-	 * The max packet size attributes of the K8061
-	 * input/output endpoints are identical
-	 */
-	size = usb_endpoint_maxp(devpriv->ep_tx);
+	tx_size = usb_endpoint_maxp(devpriv->ep_tx);
+	rx_size = usb_endpoint_maxp(devpriv->ep_rx);
usb_bulk_msg(usb, tx_pipe, devpriv->usb_tx_buf,
-		     size, NULL, devpriv->ep_tx->bInterval);
-	usb_bulk_msg(usb, rx_pipe, devpriv->usb_rx_buf, size, NULL, HZ * 10);
+		     tx_size, NULL, devpriv->ep_tx->bInterval);
+
+	usb_bulk_msg(usb, rx_pipe, devpriv->usb_rx_buf, rx_size, NULL, HZ * 10);
  }
static int vmk80xx_read_packet(struct comedi_device *dev)


Looks good, thanks!

Reviewed-by: Ian Abbott <abbotti@xxxxxxxxx>

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