[PATCH 4.9 097/134] USB: serial: mos7840: fix error code in mos7840_write()

[Greg Kroah-Hartman]

From: Dan Carpenter <dan.carpen...@oracle.com>

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.carpen...@oracle.com>
Cc: sta...@vger.kernel.org
Signed-off-by: Johan Hovold <jo...@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>
---
 drivers/usb/serial/mos7840.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

--- a/drivers/usb/serial/mos7840.c
+++ b/drivers/usb/serial/mos7840.c
@@ -1362,8 +1362,10 @@ static int mos7840_write(struct tty_stru
        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);