From nobody Tue Nov 26 22:11:00 2024 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 52D952071E5; Wed, 16 Oct 2024 10:22:38 +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=1729074158; cv=none; b=VHqyF6ktkdunPxKKJfsGqKsv73zLnbP2lMQasHIfDcakoWuPbZzGEQ0SofQTHcSfmYhVRRtjk+WMWm10wLd1jP7gAFL/ZyNwcuvSfR/i9joX0RfzlJnKVJSmPi55/BNYFG+BRVAF2B0EEieL47NLEv7gLnjOnX+e5J6jc+VTbII= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1729074158; c=relaxed/simple; bh=r3DnZnXmOPL/1ov+qmgi5QK936wJgr1oE0kz+ynd/Pc=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=rBGsVlUgG+TDtYq/WnJvRRE5YV4OjyiG0M6RwzB2pYEbkzb/FXjH4WYf3JL6IbZbIU73280kJqQJgdtPGgR1R0QCHzBXfIdrPrr4I3yExKziEW7Wobo4J1J8Whw1l0pSN6VAlfVVxtSLtSmOiOrw+ziQAK4aqQi2c7CFirIsIp0= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=Zfl9cPRA; 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="Zfl9cPRA" Received: by smtp.kernel.org (Postfix) with ESMTPSA id D643CC4CED2; Wed, 16 Oct 2024 10:22:37 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1729074157; bh=r3DnZnXmOPL/1ov+qmgi5QK936wJgr1oE0kz+ynd/Pc=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Zfl9cPRAhPfLv2wztu2p7KDgxgC1zyrb0Yi1d9nhG4Ukxxgvxz8xihuf9BFqPlKzE fm9Csc4XXTzWNPzAjX8r6UvXWtpKJpylLjhtm3hSP59expzEoX8piZoDxWk0zEZ6SA B33JhgyVNiAw842u+fambh/l66WyI9v+orXuyXGbxyqonNoR9H15lj+cQMXpjKmZ4k TJo6YeYCwEO+UoEMjTuEyr2KT/93EJG1WEUx1mDN3i1VDSmO6bYGmxgeUDLKXtInu3 sX32OlWqO56APgdVzciS7cSTQFlcsp82clCBp+AwA2vSWVPacjy/wZ2IrtER+55kXc lg5e66drb6Qbw== Received: from mchehab by mail.kernel.org with local (Exim 4.98) (envelope-from ) id 1t11Ap-00000004YmR-1o4r; Wed, 16 Oct 2024 12:22:35 +0200 From: Mauro Carvalho Chehab To: Cc: Mauro Carvalho Chehab , Hans Verkuil , Mauro Carvalho Chehab , Ricardo Ribalda , linux-kernel@vger.kernel.org, linux-media@vger.kernel.org, stable@vger.kernel.org Subject: [PATCH 01/13] media: v4l2-ctrls-api: fix error handling for v4l2_g_ctrl() Date: Wed, 16 Oct 2024 12:22:17 +0200 Message-ID: X-Mailer: git-send-email 2.47.0 In-Reply-To: References: Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Sender: Mauro Carvalho Chehab Content-Type: text/plain; charset="utf-8" The error check logic at get_ctrl() is broken: if ptr_to_user() fails to fill a control due to an error, no errors are returned and v4l2_g_ctrl() returns success on a failed operation, which may cause applications to fail. Add an error check at get_ctrl() and ensure that it will be returned to userspace without filling the control value if get_ctrl() fails. Fixes: 71c689dc2e73 ("media: v4l2-ctrls: split up into four source files") Cc: stable@vger.kernel.org Signed-off-by: Mauro Carvalho Chehab --- drivers/media/v4l2-core/v4l2-ctrls-api.c | 10 +++++++--- 1 file changed, 7 insertions(+), 3 deletions(-) diff --git a/drivers/media/v4l2-core/v4l2-ctrls-api.c b/drivers/media/v4l2-= core/v4l2-ctrls-api.c index e5a364efd5e6..be32dccf9830 100644 --- a/drivers/media/v4l2-core/v4l2-ctrls-api.c +++ b/drivers/media/v4l2-core/v4l2-ctrls-api.c @@ -753,9 +753,10 @@ static int get_ctrl(struct v4l2_ctrl *ctrl, struct v4l= 2_ext_control *c) for (i =3D 0; i < master->ncontrols; i++) cur_to_new(master->cluster[i]); ret =3D call_op(master, g_volatile_ctrl); - new_to_user(c, ctrl); + if (!ret) + ret =3D new_to_user(c, ctrl); } else { - cur_to_user(c, ctrl); + ret =3D cur_to_user(c, ctrl); } v4l2_ctrl_unlock(master); return ret; @@ -770,7 +771,10 @@ int v4l2_g_ctrl(struct v4l2_ctrl_handler *hdl, struct = v4l2_control *control) if (!ctrl || !ctrl->is_int) return -EINVAL; ret =3D get_ctrl(ctrl, &c); - control->value =3D c.value; + + if (!ret) + control->value =3D c.value; + return ret; } EXPORT_SYMBOL(v4l2_g_ctrl); --=20 2.47.0