linux-kernel - [PATCH USB 1/2] usb: raw-gadget: fix return value of ep read ioctls

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-Id: <ca6b79b47313aa7ee9d8c24c5a7f595772764171.1587690539.git.andreyknvl@google.com>
Date:   Fri, 24 Apr 2020 03:09:58 +0200
From:   Andrey Konovalov <andreyknvl@...gle.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
        Felipe Balbi <balbi@...nel.org>,
        Jonathan Corbet <corbet@....net>,
        Alan Stern <stern@...land.harvard.edu>,
        Dan Carpenter <dan.carpenter@...cle.com>,
        Andrey Konovalov <andreyknvl@...gle.com>
Subject: [PATCH USB 1/2] usb: raw-gadget: fix return value of ep read ioctls

They must return the number of bytes transferred during the data stage.

Signed-off-by: Andrey Konovalov <andreyknvl@...gle.com>
---
 drivers/usb/gadget/legacy/raw_gadget.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/drivers/usb/gadget/legacy/raw_gadget.c b/drivers/usb/gadget/legacy/raw_gadget.c
index ca7d95bf7397..7b241992ad5a 100644
--- a/drivers/usb/gadget/legacy/raw_gadget.c
+++ b/drivers/usb/gadget/legacy/raw_gadget.c
@@ -669,12 +669,14 @@ static int raw_ioctl_ep0_read(struct raw_dev *dev, unsigned long value)
 	if (IS_ERR(data))
 		return PTR_ERR(data);
 	ret = raw_process_ep0_io(dev, &io, data, false);
-	if (ret)
+	if (ret < 0)
 		goto free;
 
 	length = min(io.length, (unsigned int)ret);
 	if (copy_to_user((void __user *)(value + sizeof(io)), data, length))
 		ret = -EFAULT;
+	else
+		ret = length;
 free:
 	kfree(data);
 	return ret;
@@ -964,12 +966,14 @@ static int raw_ioctl_ep_read(struct raw_dev *dev, unsigned long value)
 	if (IS_ERR(data))
 		return PTR_ERR(data);
 	ret = raw_process_ep_io(dev, &io, data, false);
-	if (ret)
+	if (ret < 0)
 		goto free;
 
 	length = min(io.length, (unsigned int)ret);
 	if (copy_to_user((void __user *)(value + sizeof(io)), data, length))
 		ret = -EFAULT;
+	else
+		ret = length;
 free:
 	kfree(data);
 	return ret;
-- 
2.26.2.303.gf8c07b1a785-goog