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 9CCA6548EE; Tue, 22 Jul 2025 14:00:45 +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=1753192845; cv=none; b=dyuYiCA2amFYd02DfouOWC+J3Y2Zbn0HaFeCESkI4/JvNtRH8UwpoSBfcCaaU1yC8KFsIoFDWnVcauQvg2BpDIbv0XwQRhJw5/DkXOL9XdyvPqNZU8sSf1wQydH+RAfAPvMa0206shtDCZcoNwgXieokxLJ4xZ3NUmf7Y35sKjc= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1753192845; c=relaxed/simple; bh=/p++4HxgkL0jk50CHSwkv/nUpkdujZWWxjU5GhBlHqE=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=gfM+yKEGXv96rTw7QPMO00NV8CSSLiXXzoYpFVbB2xQ6qbR2CVMbYM/teiEOZJ67jvvl2/nsiXxqnKSV23yUJcvJ04N5AwDQnZ9HHngRQja7dOeDP1kPmbZHqVqBTye6Y/2edKv4n8Pjmr00uGZcv2QDKgkmqvj7+0vwOIsfCsg= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=VAZx4uQP; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="VAZx4uQP" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 0A3C6C4CEEB; Tue, 22 Jul 2025 14:00:44 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1753192845; bh=/p++4HxgkL0jk50CHSwkv/nUpkdujZWWxjU5GhBlHqE=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=VAZx4uQPWPVmsS7jOUkd9pUx8/I3yNfUon8DGQ1u2p0LNqk337W1OV5KSrT7cQ/Xm d95yiUCB+mAKSZLuqGmjetq9EX5U1C0WTinJipm/un2icIilzepyFODU5Ge+Fh8uhZ jXVII0upp8FLzC4DYPQLj5IK7A5/4SPLK4cQxdQ4= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Ian Abbott Subject: [PATCH 6.12 075/158] comedi: aio_iiro_16: Fix bit shift out of bounds Date: Tue, 22 Jul 2025 15:44:19 +0200 Message-ID: <20250722134343.571080489@linuxfoundation.org> X-Mailer: git-send-email 2.50.1 In-Reply-To: <20250722134340.596340262@linuxfoundation.org> References: <20250722134340.596340262@linuxfoundation.org> User-Agent: quilt/0.68 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 6.12-stable review patch. If anyone has any objections, please let me know. ------------------ From: Ian Abbott commit 66acb1586737a22dd7b78abc63213b1bcaa100e4 upstream. When checking for a supported IRQ number, the following test is used: if ((1 << it->options[1]) & 0xdcfc) { However, `it->options[i]` is an unchecked `int` value from userspace, so the shift amount could be negative or out of bounds. Fix the test by requiring `it->options[1]` to be within bounds before proceeding with the original test. Valid `it->options[1]` values that select the IRQ will be in the range [1,15]. The value 0 explicitly disables the use of interrupts. Fixes: ad7a370c8be4 ("staging: comedi: aio_iiro_16: add command support for change of state detection") Cc: stable@vger.kernel.org # 5.13+ Signed-off-by: Ian Abbott Link: https://lore.kernel.org/r/20250707134622.75403-1-abbotti@mev.co.uk Signed-off-by: Greg Kroah-Hartman Signed-off-by: Greg Kroah-Hartman --- drivers/comedi/drivers/aio_iiro_16.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) --- a/drivers/comedi/drivers/aio_iiro_16.c +++ b/drivers/comedi/drivers/aio_iiro_16.c @@ -177,7 +177,8 @@ static int aio_iiro_16_attach(struct com * Digital input change of state interrupts are optionally supported * using IRQ 2-7, 10-12, 14, or 15. */ - if ((1 << it->options[1]) & 0xdcfc) { + if (it->options[1] > 0 && it->options[1] < 16 && + (1 << it->options[1]) & 0xdcfc) { ret = request_irq(it->options[1], aio_iiro_16_cos, 0, dev->board_name, dev); if (ret == 0)