From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (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 8DFB92D6E72 for ; Sun, 19 Jul 2026 16:31:16 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1784478677; cv=none; b=bxUNal6lhhZwLKX26jJ/DEa3pmhz62+lQmCJdnhDspKlWdhqDVxwdqStYJA53fyMQ68jl4L41dVJvEZM6yzJ9REiO7n49CtPchVhbKr3CUk54CQGnNuaESKgyOPu3T5zbEhJBG8e8ptq5o6LA0JCzbaHD6n/8WuJGfeFkPQRVbc= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1784478677; c=relaxed/simple; bh=Od4myDi+qFFdkH6+vAxHW38WtKVKEsk/FiOQhveSjtU=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=h3lu80RfVgy8TUpXp4l12DgJxXeAmCAZaLkShHEOgg3LXPS9kYCuXU6wtn8XTwtMcJ9A6LXUTxp+cIWhSvccij+vf7LMLKKmghhdpZbzgjABapWK1Q9Ib+xMGN/9aIwNuX8QOTKuJz5xBTqIxuRFLjFisWzlIVj7Lg7ASofpXLM= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=Xu9umG+R; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="Xu9umG+R" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 792C31F000E9; Sun, 19 Jul 2026 16:31:15 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1784478676; bh=rI9m02877FPyXkJkBzTUwHqYpVkgBApzLFkXZSdOPro=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=Xu9umG+RHEwvl4qg0zv7wKEnLcdU3IFfN9BfcWjbG16N4k7h9Q6PzAEY7Of/cdNoF Dx5M2xZ2jKdQByf3buYS29H7cG/0IBJqSgoN6ag9kYx/pX7n+dgfDsat4pKx6FsLpJ 00c4WGHbZ/+FPM6YW+4zuKBa4JipyARippjbHGkwGu6k4ZkrKsDc5p97JAGECnKlbF jLulkor8axBnv/0yaC6hY+Y4dINbXpoosnvwxTZpQb4fjoGvDZnd/NzgF7MYSx/cJ7 dhNxRpZqdRYWshvj9vUbUqxXhBV7p9MV3+JMxGZrE7rnjFYm5vu+Vu0GITxyNFA8tu Sp9EvmG1DaX1w== From: Sasha Levin To: stable@vger.kernel.org Cc: Oliver Neukum , Greg Kroah-Hartman , Sasha Levin Subject: [PATCH 5.15.y 1/2] usb: iowarrior: remove inherent race with minor number Date: Sun, 19 Jul 2026 12:31:12 -0400 Message-ID: <20260719163113.566274-1-sashal@kernel.org> X-Mailer: git-send-email 2.53.0 In-Reply-To: <2026071456-grueling-pucker-b80f@gregkh> References: <2026071456-grueling-pucker-b80f@gregkh> Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit From: Oliver Neukum [ Upstream commit 56dd29088c9d9510c48a8ebad2465248fde36551 ] The driver saves the minor number it gets upon registration in its descriptor for debugging purposes. However, there is inevitably a window between registration and saving the correct minor in a descriptor. During this window the debugging output will be wrong. As wrong debug output is worse than no debug output, just remove it. Signed-off-by: Oliver Neukum Link: https://patch.msgid.link/20260312094619.1590556-1-oneukum@suse.com Signed-off-by: Greg Kroah-Hartman Stable-dep-of: c602254ba4c1 ("USB: iowarrior: fix use-after-free on disconnect race") Signed-off-by: Sasha Levin --- drivers/usb/misc/iowarrior.c | 17 +++-------------- 1 file changed, 3 insertions(+), 14 deletions(-) diff --git a/drivers/usb/misc/iowarrior.c b/drivers/usb/misc/iowarrior.c index 5606c5a2624a78..770f0044d8e2ff 100644 --- a/drivers/usb/misc/iowarrior.c +++ b/drivers/usb/misc/iowarrior.c @@ -74,7 +74,6 @@ struct iowarrior { struct mutex mutex; /* locks this structure */ struct usb_device *udev; /* save off the usb device pointer */ struct usb_interface *interface; /* the interface for this device */ - unsigned char minor; /* the starting minor number for this device */ struct usb_endpoint_descriptor *int_out_endpoint; /* endpoint for reading (needed for IOW56 only) */ struct usb_endpoint_descriptor *int_in_endpoint; /* endpoint for reading */ struct urb *int_in_urb; /* the urb for reading data */ @@ -246,7 +245,6 @@ static void iowarrior_write_callback(struct urb *urb) */ static inline void iowarrior_delete(struct iowarrior *dev) { - dev_dbg(&dev->interface->dev, "minor %d\n", dev->minor); kfree(dev->int_in_buffer); usb_free_urb(dev->int_in_urb); kfree(dev->read_queue); @@ -297,9 +295,6 @@ static ssize_t iowarrior_read(struct file *file, char __user *buffer, goto exit; } - dev_dbg(&dev->interface->dev, "minor %d, count = %zd\n", - dev->minor, count); - /* read count must be packet size (+ time stamp) */ if ((count != dev->report_size) && (count != (dev->report_size + 1))) { @@ -379,8 +374,6 @@ static ssize_t iowarrior_write(struct file *file, retval = -ENODEV; goto exit; } - dev_dbg(&dev->interface->dev, "minor %d, count = %zd\n", - dev->minor, count); /* if count is 0 we're already done */ if (count == 0) { retval = 0; @@ -523,9 +516,6 @@ static long iowarrior_ioctl(struct file *file, unsigned int cmd, goto error_out; } - dev_dbg(&dev->interface->dev, "minor %d, cmd 0x%.4x, arg %ld\n", - dev->minor, cmd, arg); - retval = 0; io_res = 0; switch (cmd) { @@ -672,8 +662,6 @@ static int iowarrior_release(struct inode *inode, struct file *file) if (!dev) return -ENODEV; - dev_dbg(&dev->interface->dev, "minor %d\n", dev->minor); - /* lock our device */ mutex_lock(&dev->mutex); @@ -776,6 +764,7 @@ static int iowarrior_probe(struct usb_interface *interface, struct usb_host_interface *iface_desc; int retval = -ENOMEM; int res; + int minor; /* allocate memory for our device state and initialize it */ dev = kzalloc(sizeof(struct iowarrior), GFP_KERNEL); @@ -891,12 +880,12 @@ static int iowarrior_probe(struct usb_interface *interface, goto error; } - dev->minor = interface->minor; + minor = interface->minor; /* let the user know what node this device is now attached to */ dev_info(&interface->dev, "IOWarrior product=0x%x, serial=%s interface=%d " "now attached to iowarrior%d\n", dev->product_id, dev->chip_serial, - iface_desc->desc.bInterfaceNumber, dev->minor - IOWARRIOR_MINOR_BASE); + iface_desc->desc.bInterfaceNumber, minor - IOWARRIOR_MINOR_BASE); return retval; error: -- 2.53.0