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authorJohan Hovold <johan@kernel.org>2021-10-25 13:45:31 +0200
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2021-10-26 19:10:18 +0200
commit78cdfd62bd54af615fba9e3ca1ba35de39d3871d (patch)
tree165b9a66a1797d25dc779a94ea295aae1df7c3fd /drivers/comedi
parenta23461c47482fc232ffc9b819539d1f837adf2b1 (diff)
comedi: vmk80xx: fix bulk-buffer overflow
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@vger.kernel.org # 2.6.31 Signed-off-by: Johan Hovold <johan@kernel.org> Reviewed-by: Ian Abbott <abbotti@mev.co.uk> Link: https://lore.kernel.org/r/20211025114532.4599-5-johan@kernel.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/comedi')
-rw-r--r--drivers/comedi/drivers/vmk80xx.c16
1 files 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)