linux-kernel - [PATCH 4.19 31/81] USB: microtek: fix info-leak at probe

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Date:   Wed, 16 Oct 2019 14:50:42 -0700
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        syzbot+5630ca7c3b2be5c9da5e@...kaller.appspotmail.com,
        Johan Hovold <johan@...nel.org>,
        Oliver Neukum <oneukum@...e.com>
Subject: [PATCH 4.19 31/81] USB: microtek: fix info-leak at probe

From: Johan Hovold <johan@...nel.org>

commit 177238c3d47d54b2ed8f0da7a4290db492f4a057 upstream.

Add missing bulk-in endpoint sanity check to prevent uninitialised stack
data from being reported to the system log and used as endpoint
addresses.

Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2")
Cc: stable <stable@...r.kernel.org>
Reported-by: syzbot+5630ca7c3b2be5c9da5e@...kaller.appspotmail.com
Signed-off-by: Johan Hovold <johan@...nel.org>
Acked-by: Oliver Neukum <oneukum@...e.com>
Link: https://lore.kernel.org/r/20191003070931.17009-1-johan@kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/usb/image/microtek.c |    4 ++++
 1 file changed, 4 insertions(+)

--- a/drivers/usb/image/microtek.c
+++ b/drivers/usb/image/microtek.c
@@ -721,6 +721,10 @@ static int mts_usb_probe(struct usb_inte
 
 	}
 
+	if (ep_in_current != &ep_in_set[2]) {
+		MTS_WARNING("couldn't find two input bulk endpoints. Bailing out.\n");
+		return -ENODEV;
+	}
 
 	if ( ep_out == -1 ) {
 		MTS_WARNING( "couldn't find an output bulk endpoint. Bailing out.\n" );