USB: serial: mos7840: fix error code in mos7840_write()

BugLink: https://bugs.launchpad.net/bugs/1918974
commit a70aa7dc60099bbdcbd6faca42a915d80f31161e upstream.

This should return -ENOMEM instead of 0 if the kmalloc() fails.

Fixes: 3f5429746d91 ("USB: Moschip 7840 USB-Serial Driver")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Cc: stable@vger.kernel.org
Signed-off-by: Johan Hovold <johan@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Kamal Mostafa <kamal@canonical.com>
Signed-off-by: Kelsey Skunberg <kelsey.skunberg@canonical.com>

diff --git a/drivers/usb/serial/mos7840.c b/drivers/usb/serial/mos7840.c
index ab4bf8d6d7df08bc2b55156d0f7fba88d0ae766e..2b8a0d4b66fce59850afcbe7508bca6940898727 100644 (file)
--- a/drivers/usb/serial/mos7840.c
+++ b/drivers/usb/serial/mos7840.c
@@ -1330,8 +1330,10 @@ static int mos7840_write(struct tty_struct *tty, struct usb_serial_port *port,
        if (urb->transfer_buffer == NULL) {
                urb->transfer_buffer = kmalloc(URB_TRANSFER_BUFFER_SIZE,
                                               GFP_ATOMIC);
-               if (!urb->transfer_buffer)
+               if (!urb->transfer_buffer) {
+                       bytes_sent = -ENOMEM;
                        goto exit;
+               }
        }
        transfer_size = min(count, URB_TRANSFER_BUFFER_SIZE);