From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id A9D715683 for ; Mon, 3 Apr 2023 14:11:27 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 2F2C5C433EF; Mon, 3 Apr 2023 14:11:27 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1680531087; bh=jgleugagHvsDcjrundocwF0Tjvvzv574UhEg5C3mJN4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=JNK05oIPAGn5mSgj57ywhUmfy9tp0ACwAUDKiLX9Mip9SWJaZBLxl/tVmhhk+nQyJ S0MLe7yZQKV/eKIXJrOQPcS009mqb5NAb2AXB+H4+J3/CmJeLJVi0sFms151B6GJbS YtaJ1sR+uUWjpndnxrLTlJufOWyqT9sGEOFzwxDM= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Szymon Heidrich , Jakub Kicinski , Sasha Levin Subject: [PATCH 4.14 07/66] net: usb: smsc95xx: Limit packet length to skb->len Date: Mon, 3 Apr 2023 16:08:15 +0200 Message-Id: <20230403140352.035013768@linuxfoundation.org> X-Mailer: git-send-email 2.40.0 In-Reply-To: <20230403140351.636471867@linuxfoundation.org> References: <20230403140351.636471867@linuxfoundation.org> User-Agent: quilt/0.67 Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit From: Szymon Heidrich [ Upstream commit ff821092cf02a70c2bccd2d19269f01e29aa52cf ] 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. Fixes: 2f7ca802bdae ("net: Add SMSC LAN9500 USB2.0 10/100 ethernet adapter driver") Signed-off-by: Szymon Heidrich Reviewed-by: Jakub Kicinski Link: https://lore.kernel.org/r/20230316101954.75836-1-szymon.heidrich@gmail.com Signed-off-by: Jakub Kicinski Signed-off-by: Sasha Levin --- drivers/net/usb/smsc95xx.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/drivers/net/usb/smsc95xx.c b/drivers/net/usb/smsc95xx.c index bc6bcea67bff3..b1e3ec3dcac3b 100644 --- a/drivers/net/usb/smsc95xx.c +++ b/drivers/net/usb/smsc95xx.c @@ -1950,6 +1950,12 @@ static int smsc95xx_rx_fixup(struct usbnet *dev, struct sk_buff *skb) size = (u16)((header & RX_STS_FL_) >> 16); align_count = (4 - ((size + NET_IP_ALIGN) % 4)) % 4; + if (unlikely(size > skb->len)) { + netif_dbg(dev, rx_err, dev->net, + "size err header=0x%08x\n", header); + return 0; + } + if (unlikely(header & RX_STS_ES_)) { netif_dbg(dev, rx_err, dev->net, "Error header=0x%08x\n", header); -- 2.39.2