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 0352F2798EA; Wed, 25 Feb 2026 01:42:40 +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=1771983760; cv=none; b=Ts+ScI3TDwFEakIro4wxdceRLMiv8+yVXKRa4j+ZKndC3UyIm6CLXUv9U3EvZSYpWBmBlXi158wKuWfoN4WKUCtjoMI6tqxFzyUDTvM9YZ49fgr6gJTKhQOCU4RxmLFm1cisM1KCHkMMnIvTEQjA0lLAJ6Tu5iWRq8fm2eUd8vU= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1771983760; c=relaxed/simple; bh=8kUU9UQYeM34anwNzMRE0GMh/MfdfeYeJeYyhrFFvao=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=W+3+Wwz4iLwuuZX7waiubSMrsCso6nnDfhiCfZTfIRat8vw/rLwf71I+UmmwLEu07X5DbkVmDosxcOkVhc2/StAgWOKNl/FdxZSVeoYkMywdBPBIh0OE5EUteyTZfd4Ph/umitxqG1GwNP4w2CDEdI2f/RBpnNuqfwUF5A2qjvc= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=vy0ZwLb1; 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="vy0ZwLb1" Received: by smtp.kernel.org (Postfix) with ESMTPSA id B8BD2C116D0; Wed, 25 Feb 2026 01:42:39 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1771983759; bh=8kUU9UQYeM34anwNzMRE0GMh/MfdfeYeJeYyhrFFvao=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=vy0ZwLb1gAJRiDe4LufOcMaTdqU8eN8k55DggBI6BiXNJ4WPBvm4XhHXfR/QeBBnE MYig2HkhXIACMJhJDA1II4jx927bNXsvJjsXlWxxzeZ/oJyqXkNnvBho3KpQPQ3hVM AdI8NurEzAs5aTTuG+K5FEHw55KPjOr5yafHq5lI= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Govindarajulu Varadarajan , Caleb Sander Mateos , Ming Lei , Jens Axboe , Sasha Levin Subject: [PATCH 6.18 052/641] ublk: Validate SQE128 flag before accessing the cmd Date: Tue, 24 Feb 2026 17:16:18 -0800 Message-ID: <20260225012350.298181082@linuxfoundation.org> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20260225012348.915798704@linuxfoundation.org> References: <20260225012348.915798704@linuxfoundation.org> User-Agent: quilt/0.69 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 6.18-stable review patch. If anyone has any objections, please let me know. ------------------ From: Govindarajulu Varadarajan [ Upstream commit da7e4b75e50c087d2031a92f6646eb90f7045a67 ] ublk_ctrl_cmd_dump() accesses (header *)sqe->cmd before IO_URING_F_SQE128 flag check. This could cause out of boundary memory access. Move the SQE128 flag check earlier in ublk_ctrl_uring_cmd() to return -EINVAL immediately if the flag is not set. Fixes: 71f28f3136af ("ublk_drv: add io_uring based userspace block driver") Signed-off-by: Govindarajulu Varadarajan Reviewed-by: Caleb Sander Mateos Reviewed-by: Ming Lei Signed-off-by: Jens Axboe Signed-off-by: Sasha Levin --- drivers/block/ublk_drv.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/drivers/block/ublk_drv.c b/drivers/block/ublk_drv.c index 56058090d223e..965460d4fc76e 100644 --- a/drivers/block/ublk_drv.c +++ b/drivers/block/ublk_drv.c @@ -3841,10 +3841,10 @@ static int ublk_ctrl_uring_cmd(struct io_uring_cmd *cmd, if (issue_flags & IO_URING_F_NONBLOCK) return -EAGAIN; - ublk_ctrl_cmd_dump(cmd); - if (!(issue_flags & IO_URING_F_SQE128)) - goto out; + return -EINVAL; + + ublk_ctrl_cmd_dump(cmd); ret = ublk_check_cmd_op(cmd_op); if (ret) -- 2.51.0