From nobody Wed Dec 31 00:48:43 2025 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 677A8C4332F for ; Sun, 12 Nov 2023 15:49:14 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231708AbjKLPtP (ORCPT ); Sun, 12 Nov 2023 10:49:15 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:43734 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231810AbjKLPtJ (ORCPT ); Sun, 12 Nov 2023 10:49:09 -0500 Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id AE7B544B6; Sun, 12 Nov 2023 07:48:55 -0800 (PST) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 689F7C433C9; Sun, 12 Nov 2023 15:48:54 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1699804135; bh=6LiDksMQRO+rxTxWlTc73AISzUa+PbV4ghjGHkjraeI=; h=From:To:Cc:Subject:Date:From; b=pDIsw6KHFV8FQjDtO8zltn/UbSexTcezC5tj7z/2xYn9SVmycCdUULPPX/F6Wn3xw meFx3qCXxQ2hmtUypF5R22cQcWdgkcgpgjZfpNqHd0Vr5UWrEBE7nNjHZlZIwwOoGD rKkChfNfZe0GbknFc80h7vhql911xDI4DrA2dvEbvXtPXyIeTBFSToo14qv8zphmFm R+B1cK9KYp/UhNixgdUL8dJoDE/qeKSD9vMDFuUKz6SiLqfvyHVJ478M7xcr6tkVrr b8JbGExdcemUrn8T9UyanDS1NkFtNKpMdHIvW2J2M74A0UlrYjZ/GlcLc7Al7xF67H dxQ+66KawTmwQ== From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Philipp Stanner , Dave Airlie , Wolfram Sang , Sasha Levin , linux-i2c@vger.kernel.org Subject: [PATCH AUTOSEL 4.19] i2c: dev: copy userspace array safely Date: Sun, 12 Nov 2023 10:48:52 -0500 Message-ID: <20231112154852.229373-1-sashal@kernel.org> X-Mailer: git-send-email 2.42.0 MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore X-stable-base: Linux 4.19.298 Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" From: Philipp Stanner [ Upstream commit cc9c54232f04aef3a5d7f64a0ece7df00f1aaa3d ] i2c-dev.c utilizes memdup_user() to copy a userspace array. This is done without an overflow check. Use the new wrapper memdup_array_user() to copy the array more safely. Suggested-by: Dave Airlie Signed-off-by: Philipp Stanner Signed-off-by: Wolfram Sang Signed-off-by: Sasha Levin --- drivers/i2c/i2c-dev.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/i2c/i2c-dev.c b/drivers/i2c/i2c-dev.c index 140dd074fdee5..e4c8d029d73c0 100644 --- a/drivers/i2c/i2c-dev.c +++ b/drivers/i2c/i2c-dev.c @@ -459,8 +459,8 @@ static long i2cdev_ioctl(struct file *file, unsigned in= t cmd, unsigned long arg) if (rdwr_arg.nmsgs > I2C_RDWR_IOCTL_MAX_MSGS) return -EINVAL; =20 - rdwr_pa =3D memdup_user(rdwr_arg.msgs, - rdwr_arg.nmsgs * sizeof(struct i2c_msg)); + rdwr_pa =3D memdup_array_user(rdwr_arg.msgs, + rdwr_arg.nmsgs, sizeof(struct i2c_msg)); if (IS_ERR(rdwr_pa)) return PTR_ERR(rdwr_pa); =20 --=20 2.42.0