From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id C3BC5882B for ; Fri, 10 Mar 2023 15:08:51 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 39547C433D2; Fri, 10 Mar 2023 15:08:51 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1678460931; bh=S9f2FNBzEbICER+Kg4xDKHVBa2uOeXvky9W3drTRxic=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=GjjLer6UvcIgsELPjxUaMEkfZ5A/M3HbrXR4wnGvjZNlYcRwB8qoRPsmZ50zmyAgo pI2jvaSqtHMjXL519a5STwhD8mn2nvd9Ik1MSOvbtZ+s7T2oVz6GM/JYUa0Dl1bjwI 1eK1DqhMW2KyKmqmLK6JPnshiy2nAu7oWgASCBR8= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Harshit Mogalapalli , Jonathan Cameron , Sasha Levin Subject: [PATCH 5.10 499/529] iio: accel: mma9551_core: Prevent uninitialized variable in mma9551_read_config_word() Date: Fri, 10 Mar 2023 14:40:42 +0100 Message-Id: <20230310133827.957210718@linuxfoundation.org> X-Mailer: git-send-email 2.39.2 In-Reply-To: <20230310133804.978589368@linuxfoundation.org> References: <20230310133804.978589368@linuxfoundation.org> User-Agent: quilt/0.67 Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit From: Harshit Mogalapalli [ Upstream commit 64a68158738ec8f520347144352f7a09bdb9e169 ] Smatch Warns: drivers/iio/accel/mma9551_core.c:299 mma9551_read_config_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: No actual bug as caller checks the return value and does not use the parameter in the problem case. Signed-off-by: Harshit Mogalapalli Link: https://lore.kernel.org/r/20230126153610.3586243-1-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 aa16d66784944..9bb5c2fea08cf 100644 --- a/drivers/iio/accel/mma9551_core.c +++ b/drivers/iio/accel/mma9551_core.c @@ -296,9 +296,12 @@ int mma9551_read_config_word(struct i2c_client *client, u8 app_id, ret = mma9551_transfer(client, app_id, MMA9551_CMD_READ_CONFIG, reg, NULL, 0, (u8 *)&v, 2); + if (ret < 0) + return ret; + *val = be16_to_cpu(v); - return ret; + return 0; } EXPORT_SYMBOL(mma9551_read_config_word); -- 2.39.2