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| author | Dan Carpenter <dan.carpenter@oracle.com> | 2018-07-04 12:29:38 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-07-17 12:39:25 +0300 |
| commit | 7ce4add980f54c2ef1fe4eca4136493200292793 (patch) | |
| tree | 36c313b4d2a577152681e8847d704c6e1e9d7f1e | |
| parent | 1fb3563fac7efaf0f2b8796f9f595b3209a79db9 (diff) | |
| download | linux-7ce4add980f54c2ef1fe4eca4136493200292793.tar.xz | |
USB: serial: ch341: fix type promotion bug in ch341_control_in()
commit e33eab9ded328ccc14308afa51b5be7cbe78d30b upstream.
The "r" variable is an int and "bufsize" is an unsigned int so the
comparison is type promoted to unsigned. If usb_control_msg() returns a
negative that is treated as a high positive value and the error handling
doesn't work.
Fixes: 2d5a9c72d0c4 ("USB: serial: ch341: fix control-message error handling")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Cc: stable <stable@vger.kernel.org>
Signed-off-by: Johan Hovold <johan@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | drivers/usb/serial/ch341.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/usb/serial/ch341.c b/drivers/usb/serial/ch341.c index 351745aec0e1..578596d301b8 100644 --- a/drivers/usb/serial/ch341.c +++ b/drivers/usb/serial/ch341.c @@ -131,7 +131,7 @@ static int ch341_control_in(struct usb_device *dev, r = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), request, USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_IN, value, index, buf, bufsize, DEFAULT_TIMEOUT); - if (r < bufsize) { + if (r < (int)bufsize) { if (r >= 0) { dev_err(&dev->dev, "short control message received (%d < %u)\n", |