[lvc-project] [PATCH 5.10/5.15] Input: pegasus-notetaker - check pipe type when probing

[Vasiliy Kovalev]

From: Soumya Negi <soumya.negi97 at gmail.com>

commit b3d80fd27a3c2d8715a40cbf876139b56195f162 upstream.

Fix WARNING in pegasus_open/usb_submit_urb [1]

Warning raised because pegasus_driver submits transfer request for
bogus URB (pipe type does not match endpoint type). Add sanity check at
probe time for pipe value extracted from endpoint descriptor. Probe
will fail if sanity check fails.

Fixes: 1afca2b66aac ("Input: add Pegasus Notetaker tablet driver")
Reported-and-tested-by: syzbot+04ee0cb4caccaed12d78 at syzkaller.appspotmail.com
Signed-off-by: Soumya Negi <soumya.negi97 at gmail.com>
Link: https://lore.kernel.org/r/20230404074145.11523-1-soumya.negi97@gmail.com
Signed-off-by: Dmitry Torokhov <dmitry.torokhov at gmail.com>
[1] Link: https://syzkaller.appspot.com/bug?id=bbc107584dcf3262253ce93183e51f3612aaeb13
[ kovalev: Added the "Fixes" tag and moved the link to the Syzbot report. ]
Signed-off-by: Vasiliy Kovalev <kovalev at altlinux.org>
---
 drivers/input/tablet/pegasus_notetaker.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/input/tablet/pegasus_notetaker.c b/drivers/input/tablet/pegasus_notetaker.c
index 749edbdb7ffa49..e79621fd84af39 100644
--- a/drivers/input/tablet/pegasus_notetaker.c
+++ b/drivers/input/tablet/pegasus_notetaker.c
@@ -296,6 +296,12 @@ static int pegasus_probe(struct usb_interface *intf,
 	pegasus->intf = intf;
 
 	pipe = usb_rcvintpipe(dev, endpoint->bEndpointAddress);
+	/* Sanity check that pipe's type matches endpoint's type */
+	if (usb_pipe_type_check(dev, pipe)) {
+		error = -EINVAL;
+		goto err_free_mem;
+	}
+
 	pegasus->data_len = usb_maxpacket(dev, pipe, usb_pipeout(pipe));
 
 	pegasus->data = usb_alloc_coherent(dev, pegasus->data_len, GFP_KERNEL,
-- 
2.42.2