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 EAF208BE0 for ; Tue, 28 Mar 2023 14:45:57 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 6BF17C433D2; Tue, 28 Mar 2023 14:45:57 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1680014757; bh=wlhbqFtoERqWL/M7yPD7+9cywiy3LE2UZ6bt7j9ScuA=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=X5mv5C3yfmBd/3Ev94oe422Llf3y6G5mMjYnC1ruLLF6qJIaOJCVy1R9llgHks0g1 xDi7IASEQNxUQfcu3TuV3/NzS5Ub6L4PqjNR4i/0hfs8fjuyqIOcfb0k2OJ4xrwn3k JZx41DBW8/e4dwm8lK7GufzguhllO24uTCBgnP70= 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 6.2 042/240] net: usb: smsc95xx: Limit packet length to skb->len Date: Tue, 28 Mar 2023 16:40:05 +0200 Message-Id: <20230328142621.466460668@linuxfoundation.org> X-Mailer: git-send-email 2.40.0 In-Reply-To: <20230328142619.643313678@linuxfoundation.org> References: <20230328142619.643313678@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 32d2c60d334dc..563ecd27b93ea 100644 --- a/drivers/net/usb/smsc95xx.c +++ b/drivers/net/usb/smsc95xx.c @@ -1833,6 +1833,12 @@ 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