From patchwork Mon Mar 14 11:34:16 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg KH X-Patchwork-Id: 551810 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 1E4E2C433EF for ; Mon, 14 Mar 2022 11:35:12 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S239078AbiCNLgT (ORCPT ); Mon, 14 Mar 2022 07:36:19 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:35264 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S239109AbiCNLgS (ORCPT ); Mon, 14 Mar 2022 07:36:18 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [139.178.84.217]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id DC389427EE; Mon, 14 Mar 2022 04:35:05 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id 7725361142; Mon, 14 Mar 2022 11:35:05 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 740F0C36AE2; Mon, 14 Mar 2022 11:35:04 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1647257704; bh=pOh6oEdiUiwGX1Cnz0whH2hcdI9uWATi2nDUXmbc9Ic=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=w4VGxwJRNlAAAyp/HBmhQHWHaMbG15rXYsU2kDS0XoR6X1NnoJc+plAr6EQ7jJPGB diPBNuY2WK20FlokhvD0a3+Hy8P6mJhu7l0CLZFRfQC4CyMMLbqzhT/Uyc0wEpq89A 3FEt1rrIfBDpe5vqLT5RITgPeXPgLsBwaAos9sPI= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, kernel test robot , Dan Carpenter Subject: [PATCH 4.9 15/20] staging: gdm724x: fix use after free in gdm_lte_rx() Date: Mon, 14 Mar 2022 12:34:16 +0100 Message-Id: <20220314112730.948395957@linuxfoundation.org> X-Mailer: git-send-email 2.35.1 In-Reply-To: <20220314112730.388955049@linuxfoundation.org> References: <20220314112730.388955049@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Dan Carpenter commit fc7f750dc9d102c1ed7bbe4591f991e770c99033 upstream. The netif_rx_ni() function frees the skb so we can't dereference it to save the skb->len. Fixes: 61e121047645 ("staging: gdm7240: adding LTE USB driver") Cc: stable Reported-by: kernel test robot Signed-off-by: Dan Carpenter Link: https://lore.kernel.org/r/20220228074331.GA13685@kili Signed-off-by: Greg Kroah-Hartman --- drivers/staging/gdm724x/gdm_lte.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) --- a/drivers/staging/gdm724x/gdm_lte.c +++ b/drivers/staging/gdm724x/gdm_lte.c @@ -85,14 +85,15 @@ static void tx_complete(void *arg) static int gdm_lte_rx(struct sk_buff *skb, struct nic *nic, int nic_type) { - int ret; + int ret, len; + len = skb->len + ETH_HLEN; ret = netif_rx_ni(skb); if (ret == NET_RX_DROP) { nic->stats.rx_dropped++; } else { nic->stats.rx_packets++; - nic->stats.rx_bytes += skb->len + ETH_HLEN; + nic->stats.rx_bytes += len; } return 0;