+++ /dev/null
-From 7a657bc8aefd38591aa4992b226a4e5dbdc65d03 Mon Sep 17 00:00:00 2001
-From: Sasha Levin <sashal@kernel.org>
-Date: Sat, 14 Oct 2023 12:20:15 +0200
-Subject: Input: bcm5974 - check endpoint type before starting traffic
-
-From: Javier Carrasco <javier.carrasco.cruz@gmail.com>
-
-[ Upstream commit 2b9c3eb32a699acdd4784d6b93743271b4970899 ]
-
-syzbot has found a type mismatch between a USB pipe and the transfer
-endpoint, which is triggered by the bcm5974 driver[1].
-
-This driver expects the device to provide input interrupt endpoints and
-if that is not the case, the driver registration should terminate.
-
-Repros are available to reproduce this issue with a certain setup for
-the dummy_hcd, leading to an interrupt/bulk mismatch which is caught in
-the USB core after calling usb_submit_urb() with the following message:
-"BOGUS urb xfer, pipe 1 != type 3"
-
-Some other device drivers (like the appletouch driver bcm5974 is mainly
-based on) provide some checking mechanism to make sure that an IN
-interrupt endpoint is available. In this particular case the endpoint
-addresses are provided by a config table, so the checking can be
-targeted to the provided endpoints.
-
-Add some basic checking to guarantee that the endpoints available match
-the expected type for both the trackpad and button endpoints.
-
-This issue was only found for the trackpad endpoint, but the checking
-has been added to the button endpoint as well for the same reasons.
-
-Given that there was never a check for the endpoint type, this bug has
-been there since the first implementation of the driver (f89bd95c5c94).
-
-[1] https://syzkaller.appspot.com/bug?extid=348331f63b034f89b622
-
-Fixes: f89bd95c5c94 ("Input: bcm5974 - add driver for Macbook Air and Pro Penryn touchpads")
-Signed-off-by: Javier Carrasco <javier.carrasco.cruz@gmail.com>
-Reported-and-tested-by: syzbot+348331f63b034f89b622@syzkaller.appspotmail.com
-Link: https://lore.kernel.org/r/20231007-topic-bcm5974_bulk-v3-1-d0f38b9d2935@gmail.com
-Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
-Signed-off-by: Sasha Levin <sashal@kernel.org>
----
- drivers/input/mouse/bcm5974.c | 20 ++++++++++++++++++++
- 1 file changed, 20 insertions(+)
-
-diff --git a/drivers/input/mouse/bcm5974.c b/drivers/input/mouse/bcm5974.c
-index ca150618d32f1..953992b458e9f 100644
---- a/drivers/input/mouse/bcm5974.c
-+++ b/drivers/input/mouse/bcm5974.c
-@@ -19,6 +19,7 @@
- * Copyright (C) 2006 Nicolas Boichat (nicolas@boichat.ch)
- */
-
-+#include "linux/usb.h"
- #include <linux/kernel.h>
- #include <linux/errno.h>
- #include <linux/slab.h>
-@@ -193,6 +194,8 @@ enum tp_type {
-
- /* list of device capability bits */
- #define HAS_INTEGRATED_BUTTON 1
-+/* maximum number of supported endpoints (currently trackpad and button) */
-+#define MAX_ENDPOINTS 2
-
- /* trackpad finger data block size */
- #define FSIZE_TYPE1 (14 * sizeof(__le16))
-@@ -891,6 +894,18 @@ static int bcm5974_resume(struct usb_interface *iface)
- return error;
- }
-
-+static bool bcm5974_check_endpoints(struct usb_interface *iface,
-+ const struct bcm5974_config *cfg)
-+{
-+ u8 ep_addr[MAX_ENDPOINTS + 1] = {0};
-+
-+ ep_addr[0] = cfg->tp_ep;
-+ if (cfg->tp_type == TYPE1)
-+ ep_addr[1] = cfg->bt_ep;
-+
-+ return usb_check_int_endpoints(iface, ep_addr);
-+}
-+
- static int bcm5974_probe(struct usb_interface *iface,
- const struct usb_device_id *id)
- {
-@@ -903,6 +918,11 @@ static int bcm5974_probe(struct usb_interface *iface,
- /* find the product index */
- cfg = bcm5974_get_config(udev);
-
-+ if (!bcm5974_check_endpoints(iface, cfg)) {
-+ dev_err(&iface->dev, "Unexpected non-int endpoint\n");
-+ return -ENODEV;
-+ }
-+
- /* allocate memory for our device state and initialize it */
- dev = kzalloc(sizeof(struct bcm5974), GFP_KERNEL);
- input_dev = input_allocate_device();
---
-2.43.0
-