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 A504342DFE5; Tue, 5 May 2026 12:35:09 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1777984509; cv=none; b=rc+S/XmAC2mDMZStHj6xGZR1c9gMVHlCwYddPjtVYsPINT9t+HUSi5+CPdbz9T3IAn6PW+ya7oakTyJb2RAuJ7ErRL+L0zEyReVGt9oT1RQpHaps9LB+JFngxLo+BuQiVejLYecWZQp5R21w+c61dm8JqX1np2hsFtT5TCe1UZQ= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1777984509; c=relaxed/simple; bh=7Mc0VNRZ1CCHsXaSFdFIyxqQMqScXwRjdBvOyAElbig=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=pGNzji7BIQjktJF/DQ4HFffJoHJ1HM6moNJocyQ57cwLI2MyllKKZftz0Awft7/lhijKD9efCwP91HtSG5nRNXUTxkYQWNNefcOVQoWu4IiLqHav9hIIf8QjQeuofFpTM6JkLNTOZufh4JEBn86l1RPS0MCeP9+vTdjS2MK/Ie0= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=uEZ4ERtp; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="uEZ4ERtp" Received: by smtp.kernel.org (Postfix) with ESMTPS id 6AC72C2BCC7; Tue, 5 May 2026 12:35:09 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1777984509; bh=7Mc0VNRZ1CCHsXaSFdFIyxqQMqScXwRjdBvOyAElbig=; h=From:Date:Subject:References:In-Reply-To:To:Cc:Reply-To:From; b=uEZ4ERtpg3RakOZy1INr8LTEL2T95YyOVDLH8P5IfoVnABOq69JOcm7S8A1M8O6mS D8Sz679RRzdIzG6H32JJ0UI51Qr89qvLwNXBcIca6EEnVvIfcNh/ylIrBBNnBFK6TV fB26H6WD3Xn9EXHCwhurSDv0haCQuF2QjPoXnLjhKHphGTI53hTxZ0zFu0wguuFnjU SQto9/UDBQxXyoI6DpJe7dyrVBUo2a+nvzYFgvcu4DLbOHDdb2GmqPH9Y68aEeJQib KVcCoRb6ZA2CyjmuEjS/QYmLrnDL9P/DmtTwdD5pjW/lulp2V0cc8FM7Lu6/qeMbqU EQgZN670uAOiw== Received: from aws-us-west-2-korg-lkml-1.web.codeaurora.org (localhost.localdomain [127.0.0.1]) by smtp.lore.kernel.org (Postfix) with ESMTP id 5BEE8CD3436; Tue, 5 May 2026 12:35:09 +0000 (UTC) From: Rodrigo Alencar via B4 Relay Date: Tue, 05 May 2026 13:35:03 +0100 Subject: [PATCH v6 02/12] iio: dac: ad5686: fix input raw value check Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <20260505-ad5686-fixes-v6-2-c2d5f7be32be@analog.com> References: <20260505-ad5686-fixes-v6-0-c2d5f7be32be@analog.com> In-Reply-To: <20260505-ad5686-fixes-v6-0-c2d5f7be32be@analog.com> To: linux-iio@vger.kernel.org, linux-kernel@vger.kernel.org, Stefan Popa , Jonathan Cameron , Greg Kroah-Hartman , Michael Auchter , Jonathan Cameron Cc: Lars-Peter Clausen , Michael Hennerich , Jonathan Cameron , David Lechner , Andy Shevchenko , Rodrigo Alencar , Andy Shevchenko X-Mailer: b4 0.14.3 X-Developer-Signature: v=1; a=ed25519-sha256; t=1777984508; l=1063; i=rodrigo.alencar@analog.com; s=default; h=from:subject:message-id; bh=vDIfN7HwJer2abOZhavJmea2PyXmNcae90gQrhX9MT8=; b=GbPPBOuE8ZsTsB76EzvPTvkHlv8/PT/y7+VJ0OfLqGDiH655DAG/GTWnJxxnOOaMQO3NbC9TE y1Zos5DQp7zAiJHTx+SltBXATKs7zqe4HKPLcLXNhzUa5VlnwPKlxmD X-Developer-Key: i=rodrigo.alencar@analog.com; a=ed25519; pk=ULeHbgU/OYh/PG/4anHDfLgldFItQHAhOktYRVLMFRo= X-Endpoint-Received: by B4 Relay for rodrigo.alencar@analog.com/default with auth_id=561 X-Original-From: Rodrigo Alencar Reply-To: rodrigo.alencar@analog.com From: Rodrigo Alencar Fix range check for input raw value, which is off by one, i.e., for a 10-bit DAC the max valid value is 1023, but 1 << 10 equals 1024, which passes the previous check, allowing an out-of-range write. The issue exists since the ad5686 driver was first introduced. Fixes: c2f37c8dcadc ("iio: dac: New driver for AD5686R, AD5685R, AD5684R Digital to analog converters") Reviewed-by: Andy Shevchenko Signed-off-by: Rodrigo Alencar --- drivers/iio/dac/ad5686.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/iio/dac/ad5686.c b/drivers/iio/dac/ad5686.c index 1fc54c38b629..076fe8b8bd85 100644 --- a/drivers/iio/dac/ad5686.c +++ b/drivers/iio/dac/ad5686.c @@ -154,7 +154,7 @@ static int ad5686_write_raw(struct iio_dev *indio_dev, switch (mask) { case IIO_CHAN_INFO_RAW: - if (val > (1 << chan->scan_type.realbits) || val < 0) + if (val >= (1 << chan->scan_type.realbits) || val < 0) return -EINVAL; mutex_lock(&st->lock); -- 2.43.0