From patchwork Mon Jul 19 14:52:52 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg Kroah-Hartman X-Patchwork-Id: 480460 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=-20.2 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER, INCLUDES_PATCH, MAILING_LIST_MULTI, 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 6475DC64E61 for ; Mon, 19 Jul 2021 16:26:57 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 42AD661241 for ; Mon, 19 Jul 2021 16:26:57 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S236917AbhGSPqQ (ORCPT ); Mon, 19 Jul 2021 11:46:16 -0400 Received: from mail.kernel.org ([198.145.29.99]:37992 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234423AbhGSPnB (ORCPT ); Mon, 19 Jul 2021 11:43:01 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id 065B16143A; Mon, 19 Jul 2021 16:22:09 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1626711730; bh=hwI9xTL2ebUdO0DmxdC1jpzwPPvsqSev3UsSzitDOfE=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=PkctINQm6BnllANKf2NPNB0AWfeofvijz7LTq3tdDuu2TmKEsMS3MiOX9ka5Sl8wp LtGZwQkiUVXQcC4dzU7Uy5/ABay5hqqNPfoxise/eOdwalxZ4UfR8tUEfCa/nmcaVF 5wwAXTbbUqIexP0YDI5kAAVGG9pUFH/qT7MzHmFk= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Yizhuo , Dmitry Torokhov , Sasha Levin Subject: [PATCH 5.12 110/292] Input: hideep - fix the uninitialized use in hideep_nvm_unlock() Date: Mon, 19 Jul 2021 16:52:52 +0200 Message-Id: <20210719144946.117660193@linuxfoundation.org> X-Mailer: git-send-email 2.32.0 In-Reply-To: <20210719144942.514164272@linuxfoundation.org> References: <20210719144942.514164272@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Yizhuo Zhai [ Upstream commit cac7100d4c51c04979dacdfe6c9a5e400d3f0a27 ] Inside function hideep_nvm_unlock(), variable "unmask_code" could be uninitialized if hideep_pgm_r_reg() returns error, however, it is used in the later if statement after an "and" operation, which is potentially unsafe. Signed-off-by: Yizhuo Signed-off-by: Dmitry Torokhov Signed-off-by: Sasha Levin --- drivers/input/touchscreen/hideep.c | 13 ++++++++++--- 1 file changed, 10 insertions(+), 3 deletions(-) diff --git a/drivers/input/touchscreen/hideep.c b/drivers/input/touchscreen/hideep.c index ddad4a82a5e5..e9547ee29756 100644 --- a/drivers/input/touchscreen/hideep.c +++ b/drivers/input/touchscreen/hideep.c @@ -361,13 +361,16 @@ static int hideep_enter_pgm(struct hideep_ts *ts) return -EIO; } -static void hideep_nvm_unlock(struct hideep_ts *ts) +static int hideep_nvm_unlock(struct hideep_ts *ts) { u32 unmask_code; + int error; hideep_pgm_w_reg(ts, HIDEEP_FLASH_CFG, HIDEEP_NVM_SFR_RPAGE); - hideep_pgm_r_reg(ts, 0x0000000C, &unmask_code); + error = hideep_pgm_r_reg(ts, 0x0000000C, &unmask_code); hideep_pgm_w_reg(ts, HIDEEP_FLASH_CFG, HIDEEP_NVM_DEFAULT_PAGE); + if (error) + return error; /* make it unprotected code */ unmask_code &= ~HIDEEP_PROT_MODE; @@ -384,6 +387,8 @@ static void hideep_nvm_unlock(struct hideep_ts *ts) NVM_W_SFR(HIDEEP_NVM_MASK_OFS, ts->nvm_mask); SET_FLASH_HWCONTROL(); hideep_pgm_w_reg(ts, HIDEEP_FLASH_CFG, HIDEEP_NVM_DEFAULT_PAGE); + + return 0; } static int hideep_check_status(struct hideep_ts *ts) @@ -462,7 +467,9 @@ static int hideep_program_nvm(struct hideep_ts *ts, u32 addr = 0; int error; - hideep_nvm_unlock(ts); + error = hideep_nvm_unlock(ts); + if (error) + return error; while (ucode_len > 0) { xfer_len = min_t(size_t, ucode_len, HIDEEP_NVM_PAGE_SIZE);