linux-kernel - [PATCH 3.16 018/136] USB: microtek: fix info-leak at probe

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Date:   Tue, 17 Dec 2019 00:45:52 +0000
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org, Denis Kirjanov <kda@...ux-powerpc.org>,
        syzbot+5630ca7c3b2be5c9da5e@...kaller.appspotmail.com,
        "Johan Hovold" <johan@...nel.org>,
        "Greg Kroah-Hartman" <gregkh@...uxfoundation.org>,
        "Oliver Neukum" <oneukum@...e.com>
Subject: [PATCH 3.16 018/136] USB: microtek: fix info-leak at probe

3.16.80-rc1 review patch.  If anyone has any objections, please let me know.

------------------

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")
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>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 drivers/usb/image/microtek.c | 4 ++++
 1 file changed, 4 insertions(+)

--- a/drivers/usb/image/microtek.c
+++ b/drivers/usb/image/microtek.c
@@ -727,6 +727,10 @@ 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" );