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 X-Spam-Level: X-Spam-Status: No, score=-6.8 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 4C871C433E2 for ; Fri, 5 Jun 2020 14:15:59 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 202B42063A for ; Fri, 5 Jun 2020 14:15:59 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1591366559; bh=KX0wPoZfWnP4R5JzHVE4rOgaZ7FssBpsYKHdzxcphs4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=q6bMJV7fa9Q9MrHmHJrnhsobIAeAWgzUMAFc4MKORUFoBLd8xFDqdjC854YR6+HZG OoEv0igi7PZtYtHYs84cgpgjITsAjcjc4fxe0w7D4ysWEjVmZDr74JYjBIfkCp8VAV C8PbnJf/79tAU6AdKp6WE6rpAh6FrwCPYT0Rv9jQ= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728109AbgFEOP6 (ORCPT ); Fri, 5 Jun 2020 10:15:58 -0400 Received: from mail.kernel.org ([198.145.29.99]:44714 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728093AbgFEOP4 (ORCPT ); Fri, 5 Jun 2020 10:15:56 -0400 Received: from localhost (83-86-89-107.cable.dynamic.v4.ziggo.nl [83.86.89.107]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 4D2A62063A; Fri, 5 Jun 2020 14:15:55 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1591366555; bh=KX0wPoZfWnP4R5JzHVE4rOgaZ7FssBpsYKHdzxcphs4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=ll9UnDK2m6y0e5xmEfBq7R+5Y7dNuaPC770T+XJu8652IOcxLn8GCYhpfdLW8v81K FadxOdNxDdvqMycIKMn1yKlm7kXloluu51Ak0Kvac8Gyh3d9TZqIoRGZRJn6uZWd1b B7Q4Q1vycNA6ChXYWBHD5wHv3NAWIZgJUD6ZyZYI= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Hu Jiahui , Dan Carpenter , Eric Dumazet , Kalle Valo Subject: [PATCH 5.7 14/14] airo: Fix read overflows sending packets Date: Fri, 5 Jun 2020 16:15:04 +0200 Message-Id: <20200605135951.863796958@linuxfoundation.org> X-Mailer: git-send-email 2.27.0 In-Reply-To: <20200605135951.018731965@linuxfoundation.org> References: <20200605135951.018731965@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Dan Carpenter commit 11e7a91994c29da96d847f676be023da6a2c1359 upstream. The problem is that we always copy a minimum of ETH_ZLEN (60) bytes from skb->data even when skb->len is less than ETH_ZLEN so it leads to a read overflow. The fix is to pad skb->data to at least ETH_ZLEN bytes. Cc: Reported-by: Hu Jiahui Signed-off-by: Dan Carpenter Reviewed-by: Eric Dumazet Signed-off-by: Kalle Valo Link: https://lore.kernel.org/r/20200527184830.GA1164846@mwanda Signed-off-by: Greg Kroah-Hartman --- drivers/net/wireless/cisco/airo.c | 12 ++++++++++++ 1 file changed, 12 insertions(+) --- a/drivers/net/wireless/cisco/airo.c +++ b/drivers/net/wireless/cisco/airo.c @@ -1925,6 +1925,10 @@ static netdev_tx_t mpi_start_xmit(struct airo_print_err(dev->name, "%s: skb == NULL!",__func__); return NETDEV_TX_OK; } + if (skb_padto(skb, ETH_ZLEN)) { + dev->stats.tx_dropped++; + return NETDEV_TX_OK; + } npacks = skb_queue_len (&ai->txq); if (npacks >= MAXTXQ - 1) { @@ -2127,6 +2131,10 @@ static netdev_tx_t airo_start_xmit(struc airo_print_err(dev->name, "%s: skb == NULL!", __func__); return NETDEV_TX_OK; } + if (skb_padto(skb, ETH_ZLEN)) { + dev->stats.tx_dropped++; + return NETDEV_TX_OK; + } /* Find a vacant FID */ for( i = 0; i < MAX_FIDS / 2 && (fids[i] & 0xffff0000); i++ ); @@ -2201,6 +2209,10 @@ static netdev_tx_t airo_start_xmit11(str airo_print_err(dev->name, "%s: skb == NULL!", __func__); return NETDEV_TX_OK; } + if (skb_padto(skb, ETH_ZLEN)) { + dev->stats.tx_dropped++; + return NETDEV_TX_OK; + } /* Find a vacant FID */ for( i = MAX_FIDS / 2; i < MAX_FIDS && (fids[i] & 0xffff0000); i++ );