From: Dan Carpenter <dan.carpenter@oracle.com>
Date: Tue, 26 Jan 2021 10:26:54 +0000 (+0300)
Subject: USB: serial: mos7840: fix error code in mos7840_write()
X-Git-Tag: v4.4.259~26
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=9a80a0d4cf6af3ca55f34474aa5f7085e7ba6813;p=thirdparty%2Fkernel%2Fstable.git

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

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>
---

diff --git a/drivers/usb/serial/mos7840.c b/drivers/usb/serial/mos7840.c
index 4add6bc38d645..7a9b9542882fd 100644
--- a/drivers/usb/serial/mos7840.c
+++ b/drivers/usb/serial/mos7840.c
@@ -1362,8 +1362,10 @@ 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);