From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id EBA18C433FE for ; Tue, 12 Apr 2022 01:02:27 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1345324AbiDLBEM (ORCPT ); Mon, 11 Apr 2022 21:04:12 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:60756 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1345256AbiDLA6b (ORCPT ); Mon, 11 Apr 2022 20:58:31 -0400 Received: from ams.source.kernel.org (ams.source.kernel.org [145.40.68.75]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 71A2A2FE76; Mon, 11 Apr 2022 17:51:28 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ams.source.kernel.org (Postfix) with ESMTPS id 1B2C4B815C8; Tue, 12 Apr 2022 00:51:27 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id DE46AC385A4; Tue, 12 Apr 2022 00:51:24 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1649724685; bh=Wlepa6YIr2hY5FeD4yQs2YIwB5qn8KB5kc30quQBXrE=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=sp29ux/f+ByKrw1tqDZig35b/jNAf7dvxrjR0vgnNbRRvi6Jzov75lNCyGz+AoS0y RehVpAV8dtxLFIcnOQVtufvZ4W5MCV9kYsIjfTSwsuLquYPIXYhFYQNrbsA7l2e3r9 9e9RaZDsMypH+IB5cfxxFKLvOrIMpLe18Yl8bLfqQdbLKUW+LsQALm0Eig2U/kBr3x u5DJWrW7d+Xcivsk8kKsvDP/CmKEuueGd7v6Rmm4Md6vEsS2E4MV8wC/HvnS8kRDig +k0Xs1bQ6mVKDzaygkW8qUgMZ1D7ENll/GLIJv5RQdGM2WGin+vJmz2PYMHVDkc8KN lzjd4bGmBrSIw== From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Marcin Kozlowski , "David S . Miller" , Sasha Levin , kuba@kernel.org, pabeni@redhat.com, linux-usb@vger.kernel.org, netdev@vger.kernel.org Subject: [PATCH AUTOSEL 5.4 15/21] net: usb: aqc111: Fix out-of-bounds accesses in RX fixup Date: Mon, 11 Apr 2022 20:50:34 -0400 Message-Id: <20220412005042.351105-15-sashal@kernel.org> X-Mailer: git-send-email 2.35.1 In-Reply-To: <20220412005042.351105-1-sashal@kernel.org> References: <20220412005042.351105-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Marcin Kozlowski [ Upstream commit afb8e246527536848b9b4025b40e613edf776a9d ] aqc111_rx_fixup() contains several out-of-bounds accesses that can be triggered by a malicious (or defective) USB device, in particular: - The metadata array (desc_offset..desc_offset+2*pkt_count) can be out of bounds, causing OOB reads and (on big-endian systems) OOB endianness flips. - A packet can overlap the metadata array, causing a later OOB endianness flip to corrupt data used by a cloned SKB that has already been handed off into the network stack. - A packet SKB can be constructed whose tail is far beyond its end, causing out-of-bounds heap data to be considered part of the SKB's data. Found doing variant analysis. Tested it with another driver (ax88179_178a), since I don't have a aqc111 device to test it, but the code looks very similar. Signed-off-by: Marcin Kozlowski Signed-off-by: David S. Miller Signed-off-by: Sasha Levin --- drivers/net/usb/aqc111.c | 9 +++++++-- 1 file changed, 7 insertions(+), 2 deletions(-) diff --git a/drivers/net/usb/aqc111.c b/drivers/net/usb/aqc111.c index 7e44110746dd..68912e266826 100644 --- a/drivers/net/usb/aqc111.c +++ b/drivers/net/usb/aqc111.c @@ -1102,10 +1102,15 @@ static int aqc111_rx_fixup(struct usbnet *dev, struct sk_buff *skb) if (start_of_descs != desc_offset) goto err; - /* self check desc_offset from header*/ - if (desc_offset >= skb_len) + /* self check desc_offset from header and make sure that the + * bounds of the metadata array are inside the SKB + */ + if (pkt_count * 2 + desc_offset >= skb_len) goto err; + /* Packets must not overlap the metadata array */ + skb_trim(skb, desc_offset); + if (pkt_count == 0) goto err; -- 2.35.1