From fc3ef2e3297b3c0e2006b5d7b3d66965e3392036 Mon Sep 17 00:00:00 2001
From: Pavel Skripkin <paskripkin@gmail.com>
Date: Sun, 20 Feb 2022 19:01:14 +0300
Subject: [PATCH] HID: hid-thrustmaster: fix OOB read in thrustmaster_interrupts
Git-commit: fc3ef2e3297b3c0e2006b5d7b3d66965e3392036
Patch-mainline: v5.17
References: git-fixes
Syzbot reported an slab-out-of-bounds Read in thrustmaster_probe() bug.
The root case is in missing validation check of actual number of endpoints.
Code should not blindly access usb_host_interface::endpoint array, since
it may contain less endpoints than code expects.
Fix it by adding missing validaion check and print an error if
number of endpoints do not match expected number
Fixes: c49c33637802 ("HID: support for initialization of some Thrustmaster wheels")
Reported-and-tested-by: syzbot+35eebd505e97d315d01c@syzkaller.appspotmail.com
Signed-off-by: Pavel Skripkin <paskripkin@gmail.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
Acked-by: Takashi Iwai <tiwai@suse.de>
---
drivers/hid/hid-thrustmaster.c | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/drivers/hid/hid-thrustmaster.c b/drivers/hid/hid-thrustmaster.c
index a4e20f9e598b..c3e6d69fdfbd 100644
--- a/drivers/hid/hid-thrustmaster.c
+++ b/drivers/hid/hid-thrustmaster.c
@@ -160,6 +160,12 @@ static void thrustmaster_interrupts(struct hid_device *hdev)
return;
}
+ if (usbif->cur_altsetting->desc.bNumEndpoints < 2) {
+ kfree(send_buf);
+ hid_err(hdev, "Wrong number of endpoints?\n");
+ return;
+ }
+
ep = &usbif->cur_altsetting->endpoint[1];
b_ep = ep->desc.bEndpointAddress;
--
2.31.1