From patchwork Fri Mar 17 15:32:17 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Szymon Heidrich X-Patchwork-Id: 13179235 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 9C18DC74A5B for ; Fri, 17 Mar 2023 15:33:59 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231201AbjCQPd5 (ORCPT ); Fri, 17 Mar 2023 11:33:57 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:40530 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229794AbjCQPd4 (ORCPT ); Fri, 17 Mar 2023 11:33:56 -0400 Received: from mail-ed1-x536.google.com (mail-ed1-x536.google.com [IPv6:2a00:1450:4864:20::536]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id A88F5C6DAA; Fri, 17 Mar 2023 08:33:24 -0700 (PDT) Received: by mail-ed1-x536.google.com with SMTP id x3so21876417edb.10; Fri, 17 Mar 2023 08:33:24 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; t=1679067203; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:from:to:cc:subject:date:message-id:reply-to; bh=27qzIXnG5Q0jlHks1WKj+gQu5XLTMem69qV8hoKqr4o=; b=Q3Qs7w86vWTu0qFSZmy7ISmo7+EQIE7FBiOa9alFZ4lDoKdZCggHwEW462NmlunnA5 J4dY0zcttWSNQBOaytcF8OkvjdWEiiLjPPU7ObttshBG11d0n6s+l76xKLNJIDRvNh5+ 1XQFJ7+PZfD+/2EQ+1gGwAue6GUjScfHUclSkZqCOCa7gyGjuuKmKna/msNLfC/iuwWQ US2GKy3wm3jRXIWDEhdWCNz0MtJ8qod7dyL2OHkwrLnIh2jAt0eSg6V8vzxxVcnZZxc9 RRHKCThHgUTN0PT4rgKp6GFl/0J01BJibJz74j8tbulqCwW9RFD23p1yRjkmLfNSWOQV x2EQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; t=1679067203; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:x-gm-message-state:from:to:cc:subject:date:message-id :reply-to; bh=27qzIXnG5Q0jlHks1WKj+gQu5XLTMem69qV8hoKqr4o=; b=lKq3DGmeJxDn5TVHO1Vf/qgq2UhJ/p2VRyDZ+U8Sy5QQaPXiDBnYF+8l1CbuQKImnr 0frZbXSoxQCMdrcnOZDmsxeK6/XWwnYoB6VCTEEk4cFCIcvqAsCIrHli/Ud6c48hX0K+ kX5FgCEo05M7Es/3WAwbtFj6YGAhmge5AnARXI87A9+9SdZa+7spRGN45jKaqEryY3kd CAg6BZV7K1Q06WcZPxkPViSDRu38/jGutig3XWiFrMXRMoDTeKKIBhBqtxEIuSwZndAP Q80nkGV/ubTaeoq7WZI81l5exQyuhc8JdH070a4cRGV1UciOmLVWJP8OEF2cJbHcMjp5 GWfA== X-Gm-Message-State: AO0yUKVIsVUTHLmLb29DlBhjkW/FXDzmN74rKVYPNwz0fGsaVLIrwwzC a333YDxbApmxwbJMoqfU3kc= X-Google-Smtp-Source: AK7set+vuy4s6wk17ZUKz4gBWr6CjZTRLrcpNGZj9AnMZ0q96JjcBRbiZUCXF352NzJbQKu4Ff9+AA== X-Received: by 2002:a17:906:a0e:b0:91e:acf4:b009 with SMTP id w14-20020a1709060a0e00b0091eacf4b009mr15142786ejf.22.1679067202968; Fri, 17 Mar 2023 08:33:22 -0700 (PDT) Received: from localhost.localdomain (077222238142.warszawa.vectranet.pl. [77.222.238.142]) by smtp.googlemail.com with ESMTPSA id b7-20020a1709064d4700b0092be5f60dd5sm1081845ejv.150.2023.03.17.08.33.19 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 17 Mar 2023 08:33:20 -0700 (PDT) From: Szymon Heidrich To: woojung.huh@microchip.com, UNGLinuxDriver@microchip.com, kuba@kernel.org, davem@davemloft.net, edumazet@google.com Cc: pabeni@redhat.com, szymon.heidrich@gmail.com, linux-usb@vger.kernel.org, netdev@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH] net: usb: lan78xx: Limit packet length to skb->len Date: Fri, 17 Mar 2023 16:32:17 +0100 Message-Id: <20230317153217.90145-1-szymon.heidrich@gmail.com> X-Mailer: git-send-email 2.40.0 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-usb@vger.kernel.org Packet length retrieved from descriptor may be larger than the actual socket buffer length. In such case the cloned skb passed up the network stack will leak kernel memory contents. Additionally prevent integer underflow when size is less than ETH_FCS_LEN. Fixes: 55d7de9de6c3 ("Microchip's LAN7800 family USB 2/3 to 10/100/1000 Ethernet device driver") Signed-off-by: Szymon Heidrich --- drivers/net/usb/lan78xx.c | 14 ++++++++++++++ 1 file changed, 14 insertions(+) diff --git a/drivers/net/usb/lan78xx.c b/drivers/net/usb/lan78xx.c index 068488890..e7d27be84 100644 --- a/drivers/net/usb/lan78xx.c +++ b/drivers/net/usb/lan78xx.c @@ -3579,10 +3579,24 @@ static int lan78xx_rx(struct lan78xx_net *dev, struct sk_buff *skb, size = (rx_cmd_a & RX_CMD_A_LEN_MASK_); align_count = (4 - ((size + RXW_PADDING) % 4)) % 4; + if (unlikely(size > skb->len)) { + netif_dbg(dev, rx_err, dev->net, + "size err rx_cmd_a=0x%08x\n", + rx_cmd_a); + return 0; + } + if (unlikely(rx_cmd_a & RX_CMD_A_RED_)) { netif_dbg(dev, rx_err, dev->net, "Error rx_cmd_a=0x%08x", rx_cmd_a); } else { + if (unlikely(size < ETH_FCS_LEN)) { + netif_dbg(dev, rx_err, dev->net, + "size err rx_cmd_a=0x%08x\n", + rx_cmd_a); + return 0; + } + u32 frame_len = size - ETH_FCS_LEN; struct sk_buff *skb2;