usb-mtp: fix error conditions for write operation

Return STORE_FULL if we can't write all the bytes but
return incomplete transfer if data received is less then
what was specified in the metadata. Also, use d->offset
as the file size which is valid for all file sizes.

Signed-off-by: Bandan <bsd@redhat.com>
Message-id: 20180907220851.9658-2-bsd@redhat.com
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>

diff --git a/hw/usb/dev-mtp.c b/hw/usb/dev-mtp.c
index 3fdc4b0da1999ba08e77017d99db458431ae4672..15edf3bb82991284477cb1220f6a2b40a8b766fa 100644 (file)
--- a/hw/usb/dev-mtp.c
+++ b/hw/usb/dev-mtp.c
@@ -1665,13 +1665,14 @@ static void usb_mtp_write_data(MTPState *s)
             goto success;
         }
 
-        rc = write_retry(d->fd, d->data, s->dataset.size);
-        if (!rc) {
+        rc = write_retry(d->fd, d->data, d->offset);
+        if (rc != d->offset) {
             usb_mtp_queue_result(s, RES_STORE_FULL, d->trans,
                                  0, 0, 0, 0);
             goto done;
             }
-        if (rc != s->dataset.size) {
+        /* Only for < 4G file sizes */
+        if (s->dataset.size != 0xFFFFFFFF && rc != s->dataset.size) {
             usb_mtp_queue_result(s, RES_INCOMPLETE_TRANSFER, d->trans,
                                  0, 0, 0, 0);
             goto done;