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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 3ACABC61DA4 for ; Fri, 3 Mar 2023 22:01:20 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233416AbjCCWBS (ORCPT ); Fri, 3 Mar 2023 17:01:18 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:32810 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233459AbjCCV7u (ORCPT ); Fri, 3 Mar 2023 16:59:50 -0500 Received: from ams.source.kernel.org (ams.source.kernel.org [IPv6:2604:1380:4601:e00::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id D44DF64A9E; Fri, 3 Mar 2023 13:51:30 -0800 (PST) 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 ams.source.kernel.org (Postfix) with ESMTPS id 93885B81A2E; Fri, 3 Mar 2023 21:48:30 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 99740C433D2; Fri, 3 Mar 2023 21:48:28 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1677880109; bh=bxehTg37MPKUyXDiE8FQ/hsQYA4wNMP4yCXdHGNkKzA=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=TcqUm7DjWw7TiQa+IEtC4w3yL/KJIQVrkmyAaFwXUZk5blCtw0KAFlKfBBL6UlYh0 2uw0aI91hUYoy1Einus1jjhDB56OMZLT/H0TANi6L8I1S+9vrjYVnEBy/WkzMm7si8 KYkd7rDR8KnBIpmL6K+UCFX/XhnM6rhvbZb0PQdEKIsSFnNCAaTftOoDvzambUmS6M MQycyyDtgXtZseDrApWWEsyBLC3iJL4jSp2r2ml9Z9p8VHqyH0vISkYyDpYhGdCB57 w49hB5du5AgrU+uijiE1zjvq3N4RPEfOnIf3Aaxl76ruAZliBys9MG3ryesJAY/DV/ /z/sPklpfZNhg== From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Harshit Mogalapalli , Jonathan Cameron , Sasha Levin , jic23@kernel.org, linux-iio@vger.kernel.org Subject: [PATCH AUTOSEL 5.4 12/20] iio: accel: mma9551_core: Prevent uninitialized variable in mma9551_read_status_word() Date: Fri, 3 Mar 2023 16:47:58 -0500 Message-Id: <20230303214806.1453287-12-sashal@kernel.org> X-Mailer: git-send-email 2.39.2 In-Reply-To: <20230303214806.1453287-1-sashal@kernel.org> References: <20230303214806.1453287-1-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: Harshit Mogalapalli [ Upstream commit e56d2c34ce9dc122b1a618172ec0e05e50adb9e9 ] Smatch Warns: drivers/iio/accel/mma9551_core.c:357 mma9551_read_status_word() error: uninitialized symbol 'v'. When (offset >= 1 << 12) is true mma9551_transfer() will return -EINVAL without 'v' being initialized, so check for the error and return. Note: Not a bug as such because the caller checks return value and doesn't not use this parameter in the problem case. Signed-off-by: Harshit Mogalapalli Link: https://lore.kernel.org/r/20230126152147.3585874-1-harshit.m.mogalapalli@oracle.com Signed-off-by: Jonathan Cameron Signed-off-by: Sasha Levin --- drivers/iio/accel/mma9551_core.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/drivers/iio/accel/mma9551_core.c b/drivers/iio/accel/mma9551_core.c index 666e7a04a7d7a..aa16d66784944 100644 --- a/drivers/iio/accel/mma9551_core.c +++ b/drivers/iio/accel/mma9551_core.c @@ -354,9 +354,12 @@ int mma9551_read_status_word(struct i2c_client *client, u8 app_id, ret = mma9551_transfer(client, app_id, MMA9551_CMD_READ_STATUS, reg, NULL, 0, (u8 *)&v, 2); + if (ret < 0) + return ret; + *val = be16_to_cpu(v); - return ret; + return 0; } EXPORT_SYMBOL(mma9551_read_status_word); -- 2.39.2