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 E95721C03 for ; Mon, 20 Mar 2023 15:00:42 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 3E8E2C433D2; Mon, 20 Mar 2023 15:00:42 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1679324442; bh=fSNPGaO9G6SKEj6KTrGd/NYKQOgHOuba4TYZZFTQS18=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=moUHnRpTa3Y8jNa5rEGctVB1d4zW1JbRZviqAtiJ25/WCTNGOj2TTJQ5U9chKmEb5 K17jYX0Ihn6xTyOdvJHQ82tv/hQdNPXu13x8JkiED7KFkBcdTHV+fqX0BVn2KTUqN2 LtrkJvCXSRTFf13juArXIOjcfjAjqI2433bCPRXI= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Szymon Heidrich , "David S. Miller" , Sasha Levin Subject: [PATCH 5.4 25/60] net: usb: smsc75xx: Limit packet length to skb->len Date: Mon, 20 Mar 2023 15:54:34 +0100 Message-Id: <20230320145431.963932245@linuxfoundation.org> X-Mailer: git-send-email 2.40.0 In-Reply-To: <20230320145430.861072439@linuxfoundation.org> References: <20230320145430.861072439@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 d8b228318935044dafe3a5bc07ee71a1f1424b8d ] Packet length retrieved from skb data may be larger than the actual socket buffer length (up to 9026 bytes). In such case the cloned skb passed up the network stack will leak kernel memory contents. Fixes: d0cad871703b ("smsc75xx: SMSC LAN75xx USB gigabit ethernet adapter driver") Signed-off-by: Szymon Heidrich Signed-off-by: David S. Miller Signed-off-by: Sasha Levin --- drivers/net/usb/smsc75xx.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/drivers/net/usb/smsc75xx.c b/drivers/net/usb/smsc75xx.c index aa848be459ec7..229ff92e41cd9 100644 --- a/drivers/net/usb/smsc75xx.c +++ b/drivers/net/usb/smsc75xx.c @@ -2210,7 +2210,8 @@ static int smsc75xx_rx_fixup(struct usbnet *dev, struct sk_buff *skb) dev->net->stats.rx_frame_errors++; } else { /* MAX_SINGLE_PACKET_SIZE + 4(CRC) + 2(COE) + 4(Vlan) */ - if (unlikely(size > (MAX_SINGLE_PACKET_SIZE + ETH_HLEN + 12))) { + if (unlikely(size > (MAX_SINGLE_PACKET_SIZE + ETH_HLEN + 12) || + size > skb->len)) { netif_dbg(dev, rx_err, dev->net, "size err rx_cmd_a=0x%08x\n", rx_cmd_a); -- 2.39.2