From nobody Fri Nov 29 19:29:28 2024 Received: from mail-pg1-f181.google.com (mail-pg1-f181.google.com [209.85.215.181]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 3A2C717BD5; Mon, 16 Sep 2024 04:06:44 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.215.181 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1726459605; cv=none; b=ApObNfNMWxey4xQV35tqsUTcpGsmq4mHpDk8FT/uggphWcZD3i+N4wMliqZuus5tc9xaKPoE8eelSqq2XpiyQYkNwGsbt+d4X7ua1CHtO8umQ7cl8PP5hoSHqIt3A0RiA5no0rrbMh2lEJGdGhRoikkMYXl/RoScOefWaIWV4XY= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1726459605; c=relaxed/simple; bh=k3wl6th9v2xDtpO7yt7lewdTKlfXWNzyqZ8vkrok6QE=; h=From:To:Cc:Subject:Date:Message-Id:MIME-Version; b=ZAmuHcFIAuC7RRPSdr9ywtjikotzKbMxwY0xx94KF1J+nqZXrdu9Tb+auMFRd7ejSYDIBZR8ZPmLa5rqxU+Z3guCZzMZhEWto4N3QTyq8BDu0aAsaSys5feEinOuIKRS0S7LrppF6SQMeeozYuoqvbGT1I+izsEpS36AmxTJf70= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com; spf=pass smtp.mailfrom=gmail.com; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b=G6WgjnEz; arc=none smtp.client-ip=209.85.215.181 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=gmail.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="G6WgjnEz" Received: by mail-pg1-f181.google.com with SMTP id 41be03b00d2f7-7cd8803fe0aso2842277a12.0; Sun, 15 Sep 2024 21:06:43 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1726459603; x=1727064403; darn=vger.kernel.org; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:from:to:cc:subject:date:message-id:reply-to; bh=SxyoIYnHclGmezcPqNhJwWRMZgFqN7bon2JJ4oYPt5A=; b=G6WgjnEzOZ4XaKP1KhWvifqKW66q4jl826MptU6Yq2oCmQswQ8+2XkjsHGiT8XQqnn cIFFMg48NHdQ/XfMqVfKf2kOa7wJgauWQw4WDeBHX0afGmqTcd1C/RlHuuwyaztrRXdo TyzT6Xsuuz/zxf8cvxx7Q7439SBSxg8LxJ60jiN9xRfxKbDprTNqHmrzgxtyaX/iwUrw IZ8jJEeTFQRATia4CrZ1Q4oZ2s2zol9TrMv8mn6vezZmp6yWBxl4JoMF9hXS6B2Pk3b3 K31cX9LNyvmZhq9aBpG+MVCCc5xKCUZk9WJR9uJPKeSCNkUCSlvmq986vhGLtUAJKhAj n/EQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1726459603; x=1727064403; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:x-gm-message-state:from:to:cc:subject:date:message-id :reply-to; bh=SxyoIYnHclGmezcPqNhJwWRMZgFqN7bon2JJ4oYPt5A=; b=h7nHgmVbz7Wzg9Wan0yjybfUmYD9+hMEobYJigIW1L2sQEYPXxs2Tw22j8zEM9j9Wb dFGFI7J8GEBrlpj/PAHwtGHVU6kOKQNktfidoCl7tIOipqP8ppwxf9hFDTl1rdYF+mlk 81isBLxe5RJY/7/FWiG/JuyqoiGaiQfO3kvTgERrZzCND3tlf7nlTJXmjhme9Nj6sjrn 5PeQ2VcUAlGJ1/Yy1/9Q7dqIbP21/58Na/dIuAfuPA/rRIGDzKvu3yBHBxq5kK7+pOs1 IhSubEz65MeGO5ZeVB7YVlC5ViT0jymGT7z3oRIj1oB4KhUJqJvlfRrWaKgmtG6QuTd4 MfdQ== X-Forwarded-Encrypted: i=1; AJvYcCV3sEevAevLdnxLaqFGA1HV9n5wQ7My/Ac50fgMsbWY09bW9VYEo0Ijoyes7Krl0C0puqC4KyCOTGXzIkA=@vger.kernel.org, AJvYcCVU7SWEZ1YhoVUg+oI8NxSVTHqqXt/CC4Y4PADZm7+/nJybxW1WpIAQ2zu9uIx3qve3qtcrk3GQ06iO@vger.kernel.org X-Gm-Message-State: AOJu0YzkjUMdH7tU+M3XTp55ROGssvN45eTAc4WPhHWxs2/lsCbxgbkl q0w4UITUiAHAKB1Hne/uWBxQq2Pbpm/62MCgwVbdc1V4q+lhk6PV+qpWiv8U X-Google-Smtp-Source: AGHT+IGIrvTG4rxcu0rMuqtYiO6D2xED+z4HCXdA1tX3SG/V4ptDMncNXfvuFIdfwQqI1zkp+I6VrQ== X-Received: by 2002:a05:6a21:4d8c:b0:1cf:6c64:ee6b with SMTP id adf61e73a8af0-1cf75f0f139mr18721512637.27.1726459603102; Sun, 15 Sep 2024 21:06:43 -0700 (PDT) Received: from kernelexploit-virtual-machine.localdomain ([121.185.186.233]) by smtp.gmail.com with ESMTPSA id 41be03b00d2f7-7db498d9845sm3397058a12.9.2024.09.15.21.06.41 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 15 Sep 2024 21:06:42 -0700 (PDT) From: Jeongjun Park To: gregkh@linuxfoundation.org Cc: colin.i.king@gmail.com, linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org, Jeongjun Park Subject: [PATCH] usb: use mutex_lock in iowarrior_read() Date: Mon, 16 Sep 2024 13:06:29 +0900 Message-Id: <20240916040629.28750-1-aha310510@gmail.com> X-Mailer: git-send-email 2.34.1 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 Content-Type: text/plain; charset="utf-8" Currently, iowarrior_read() does not provide any protection for the iowarrior structure, so the iowarrior structure is vulnerable to data-race. Therefore, I think it is appropriate to protect the structure using mutex_lock in iowarrior_read(). Fixes: 946b960d13c1 ("USB: add driver for iowarrior devices.") Signed-off-by: Jeongjun Park --- drivers/usb/misc/iowarrior.c | 42 +++++++++++++++++++++++++++--------- 1 file changed, 32 insertions(+), 10 deletions(-) diff --git a/drivers/usb/misc/iowarrior.c b/drivers/usb/misc/iowarrior.c index 6d28467ce352..7f3d37b395c3 100644 --- a/drivers/usb/misc/iowarrior.c +++ b/drivers/usb/misc/iowarrior.c @@ -277,28 +277,41 @@ static ssize_t iowarrior_read(struct file *file, char= __user *buffer, struct iowarrior *dev; int read_idx; int offset; + int retval =3D 0; =20 dev =3D file->private_data; =20 + if (!dev) { + retval =3D -ENODEV; + goto exit; + } + + mutex_lock(&dev->mutex); /* verify that the device wasn't unplugged */ - if (!dev || !dev->present) - return -ENODEV; + if (!dev->present) { + retval =3D -ENODEV; + goto unlock_exit; + } =20 dev_dbg(&dev->interface->dev, "minor %d, count =3D %zd\n", dev->minor, count); =20 /* read count must be packet size (+ time stamp) */ if ((count !=3D dev->report_size) - && (count !=3D (dev->report_size + 1))) - return -EINVAL; + && (count !=3D (dev->report_size + 1))) { + retval =3D -EINVAL; + goto unlock_exit; + } =20 /* repeat until no buffer overrun in callback handler occur */ do { atomic_set(&dev->overflow_flag, 0); if ((read_idx =3D read_index(dev)) =3D=3D -1) { /* queue empty */ - if (file->f_flags & O_NONBLOCK) - return -EAGAIN; + if (file->f_flags & O_NONBLOCK) { + retval =3D -EAGAIN; + goto unlock_exit; + } else { //next line will return when there is either new data, or the device i= s unplugged int r =3D wait_event_interruptible(dev->read_wait, @@ -309,28 +322,37 @@ static ssize_t iowarrior_read(struct file *file, char= __user *buffer, -1)); if (r) { //we were interrupted by a signal - return -ERESTART; + retval =3D -ERESTART; + goto unlock_exit; } if (!dev->present) { //The device was unplugged - return -ENODEV; + retval =3D -ENODEV; + goto unlock_exit; } if (read_idx =3D=3D -1) { // Can this happen ??? - return 0; + goto unlock_exit; } } } =20 offset =3D read_idx * (dev->report_size + 1); if (copy_to_user(buffer, dev->read_queue + offset, count)) { - return -EFAULT; + retval =3D -EFAULT; + goto unlock_exit; } } while (atomic_read(&dev->overflow_flag)); =20 read_idx =3D ++read_idx =3D=3D MAX_INTERRUPT_BUFFER ? 0 : read_idx; atomic_set(&dev->read_idx, read_idx); + mutex_unlock(&dev->mutex); return count; + +unlock_exit: + mutex_unlock(&dev->mutex); +exit: + return retval; } =20 /* --