linux-kernel - Re: [syzbot] [usb?] KASAN: slab-out-of-bounds Read in mon_copy_to

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Message-ID: <681c4eac-e812-4022-96e8-cd6cada73910@rowland.harvard.edu>
Date: Wed, 9 Jul 2025 13:52:58 -0400
From: Alan Stern <stern@...land.harvard.edu>
To: syzbot <syzbot+8258d5439c49d4c35f43@...kaller.appspotmail.com>
Cc: Benjamin Tissoires <bentiss@...nel.org>, Jiri Kosina <jikos@...nel.org>,
	linux-input@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-usb@...r.kernel.org, syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [usb?] KASAN: slab-out-of-bounds Read in
 mon_copy_to_buff

Test patch to see the contents of the report descriptor.

Alan Stern

#syz test: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/ d7b8f8e20813

Index: usb-devel/drivers/hid/usbhid/hid-core.c
===================================================================
--- usb-devel.orig/drivers/hid/usbhid/hid-core.c
+++ usb-devel/drivers/hid/usbhid/hid-core.c
@@ -1043,6 +1043,10 @@ static int usbhid_parse(struct hid_devic
 		goto err;
 	}
 
+	dev_info(&intf->dev, "Report descriptor:\n");
+	print_hex_dump(KERN_INFO, "  * ", DUMP_PREFIX_NONE, 16, 1,
+			rdesc, rsize, false);
+
 	ret = hid_parse_report(hid, rdesc, rsize);
 	kfree(rdesc);
 	if (ret) {