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Subject[PATCH 5.10 14/21] comedi: ni_usb6501: fix NULL-deref in command paths
Date
From: Johan Hovold <johan@kernel.org>

commit 907767da8f3a925b060c740e0b5c92ea7dbec440 upstream.

The driver uses endpoint-sized USB transfer buffers but had no sanity
checks on the sizes. This can lead to zero-size-pointer dereferences or
overflowed transfer buffers in ni6501_port_command() and
ni6501_counter_command() if a (malicious) device has smaller max-packet
sizes than expected (or when doing descriptor fuzz testing).

Add the missing sanity checks to probe().

Fixes: a03bb00e50ab ("staging: comedi: add NI USB-6501 support")
Cc: stable@vger.kernel.org # 3.18
Cc: Luca Ellero <luca.ellero@brickedbrain.com>
Reviewed-by: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Johan Hovold <johan@kernel.org>
Link: https://lore.kernel.org/r/20211027093529.30896-2-johan@kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
drivers/staging/comedi/drivers/ni_usb6501.c | 10 ++++++++++
1 file changed, 10 insertions(+)

--- a/drivers/staging/comedi/drivers/ni_usb6501.c
+++ b/drivers/staging/comedi/drivers/ni_usb6501.c
@@ -144,6 +144,10 @@ static const u8 READ_COUNTER_RESPONSE[]
0x00, 0x00, 0x00, 0x02,
0x00, 0x00, 0x00, 0x00};

+/* Largest supported packets */
+static const size_t TX_MAX_SIZE = sizeof(SET_PORT_DIR_REQUEST);
+static const size_t RX_MAX_SIZE = sizeof(READ_PORT_RESPONSE);
+
enum commands {
READ_PORT,
WRITE_PORT,
@@ -501,6 +505,12 @@ static int ni6501_find_endpoints(struct
if (!devpriv->ep_rx || !devpriv->ep_tx)
return -ENODEV;

+ if (usb_endpoint_maxp(devpriv->ep_rx) < RX_MAX_SIZE)
+ return -ENODEV;
+
+ if (usb_endpoint_maxp(devpriv->ep_tx) < TX_MAX_SIZE)
+ return -ENODEV;
+
return 0;
}


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