[PATCH 5.15 045/570] net: usb: kalmia: validate USB endpoints

Greg Kroah-Hartman
2026-04-13T16:20:06Z

From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

commit c58b6c29a4c9b8125e8ad3bca0637e00b71e2693 upstream.

The kalmia driver should validate that the device it is probing has the
proper number and types of USB endpoints it is expecting before it binds
to it. If a malicious device were to not have the same urbs the driver
will crash later on when it blindly accesses these endpoints.

Cc: stable <stable@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Reviewed-by: Simon Horman <horms@kernel.org>
Fixes: d40261236e8e ("net/usb: Add Samsung Kalmia driver for Samsung GT-B3730")
Link: https://patch.msgid.link/2026022326-shack-headstone-ef6f@gregkh
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
drivers/net/usb/kalmia.c | 7 +++++++
1 file changed, 7 insertions(+)

--- a/drivers/net/usb/kalmia.c
+++ b/drivers/net/usb/kalmia.c
@@ -132,11 +132,18 @@ kalmia_bind(struct usbnet *dev, struct u
{
int status;
u8 ethernet_addr[ETH_ALEN];
+ static const u8 ep_addr[] = {
+ 1 | USB_DIR_IN,
+ 2 | USB_DIR_OUT,
+ 0};

/* Don't bind to AT command interface */
if (intf->cur_altsetting->desc.bInterfaceClass != USB_CLASS_VENDOR_SPEC)
return -EINVAL;

+ if (!usb_check_bulk_endpoints(intf, ep_addr))
+ return -ENODEV;
+
dev->in = usb_rcvbulkpipe(dev->udev, 0x81 & USB_ENDPOINT_NUMBER_MASK);
dev->out = usb_sndbulkpipe(dev->udev, 0x02 & USB_ENDPOINT_NUMBER_MASK);
dev->status = NULL;