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virtio-gpu: fix unmap in error path 

We land here in case not everything we've asked for could be mapped.
So unmap only the bytes which have actually been mapped.

Also we didn't access anything, so acces_len can be 0.

Reported-by: Laszlo Ersek <lersek@redhat.com>
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Reviewed-by: Laszlo Ersek <lersek@redhat.com>
Reviewed-by: Li Qiang <liq3ea@gmail.com>
Message-id: 20190628072357.31782-1-kraxel@redhat.com
This commit is contained in:
Gerd Hoffmann 2019-06-28 09:23:57 +02:00
parent 506179e421
commit a7f85e03b9
1 changed files with 2 additions and 2 deletions
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4
hw/display/virtio-gpu.c
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@ -1048,9 +1048,9 @@ static int virtio_gpu_load(QEMUFile *f, void *opaque, size_t size,
if (res->iov[i].iov_base) {
dma_memory_unmap(VIRTIO_DEVICE(g)->dma_as,
res->iov[i].iov_base,
res->iov[i].iov_len,
len,
DMA_DIRECTION_TO_DEVICE,
res->iov[i].iov_len);
0);
}
/* ...and the mappings for previous loop iterations */
res->iov_cnt = i;