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=-20.4 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable 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 6CD76C07E95 for ; Sun, 4 Jul 2021 23:21:34 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 5937061378 for ; Sun, 4 Jul 2021 23:21:34 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233613AbhGDXYI (ORCPT ); Sun, 4 Jul 2021 19:24:08 -0400 Received: from mail.kernel.org ([198.145.29.99]:57074 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234275AbhGDXO7 (ORCPT ); Sun, 4 Jul 2021 19:14:59 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id F226361364; Sun, 4 Jul 2021 23:11:57 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1625440318; bh=J4p7LzVQQchdgunuqTzd4zWgz3g8h/zu+BG8D/ucd8I=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=AFOkdEFw6PFzbvVkXzQMStOR/ZpcRf13DIoLMYRsVb+5qzDTEccg5b0aMVHQyt+Us gNvh0vgw/YCMUzZz8+uEFydf1zpUVnuwVsma53HTUfjWYg1zFaTq4BNTvEVk1Gbqq4 nZW01s0/BPZ6URwWDVdjGBRI/gE6R8qiS5JZEGF7fSV3NBzTim3lIs2sy++0KNWO+m 3nwJdXtv+nZJ4TE8mZk+CJQyzfIBDBTCdq4KOUpMqTX/4bc7DrCYEvfNFpxc8aoeQ+ Xm0L+yJT2rvFWF1J0lzPuqqGCBbeEBh44yGUZQgGDYokHy21TRKE+TBZImTlPy0J4e xzLrh7UGNO2xg== From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Jay Fang , Mark Brown , Sasha Levin , linux-spi@vger.kernel.org Subject: [PATCH AUTOSEL 4.9 02/20] spi: spi-topcliff-pch: Fix potential double free in pch_spi_process_messages() Date: Sun, 4 Jul 2021 19:11:37 -0400 Message-Id: <20210704231155.1491795-2-sashal@kernel.org> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20210704231155.1491795-1-sashal@kernel.org> References: <20210704231155.1491795-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Jay Fang [ Upstream commit 026a1dc1af52742c5897e64a3431445371a71871 ] pch_spi_set_tx() frees data->pkt_tx_buff on failure of kzalloc() for data->pkt_rx_buff, but its caller, pch_spi_process_messages(), will free data->pkt_tx_buff again. Set data->pkt_tx_buff to NULL after kfree() to avoid double free. Signed-off-by: Jay Fang Link: https://lore.kernel.org/r/1620284888-65215-1-git-send-email-f.fangjian@huawei.com Signed-off-by: Mark Brown Signed-off-by: Sasha Levin --- drivers/spi/spi-topcliff-pch.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/drivers/spi/spi-topcliff-pch.c b/drivers/spi/spi-topcliff-pch.c index fe707440f8c3..9b24ebbba346 100644 --- a/drivers/spi/spi-topcliff-pch.c +++ b/drivers/spi/spi-topcliff-pch.c @@ -585,8 +585,10 @@ static void pch_spi_set_tx(struct pch_spi_data *data, int *bpw) data->pkt_tx_buff = kzalloc(size, GFP_KERNEL); if (data->pkt_tx_buff != NULL) { data->pkt_rx_buff = kzalloc(size, GFP_KERNEL); - if (!data->pkt_rx_buff) + if (!data->pkt_rx_buff) { kfree(data->pkt_tx_buff); + data->pkt_tx_buff = NULL; + } } if (!data->pkt_rx_buff) { -- 2.30.2