On Thu, Aug 15, 2024 at 08:21:29AM -0400, Sasha Levin wrote:

This is a note to let you know that I've just added the patch titled

Input: bcm5974 - check endpoint type before starting traffic

to the 6.6-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git%3Ba=su...

The filename of the patch is: input-bcm5974-check-endpoint-type-before-starting-tr.patch and it can be found in the queue-6.6 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let stable@vger.kernel.org know about it.

I am confused why to pick this up only to have to pick up the revert? It was not tagged for stable explicitly.

I'd expects stable scripts to check for reverts that happen almost immediately...

commit 16ae8b10b473f96b7f63add2e928d8d437c83b07 Author: Javier Carrasco javier.carrasco.cruz@gmail.com Date: Sat Oct 14 12:20:15 2023 +0200

Input: bcm5974 - check endpoint type before starting traffic

[ 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@gmai... Signed-off-by: Dmitry Torokhov dmitry.torokhov@gmail.com Signed-off-by: Sasha Levin sashal@kernel.org

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();

Thanks.