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Re: [Qemu-devel] [PATCH 1/6] virtio: introduce virtio_map
From: |
Michael S. Tsirkin |
Subject: |
Re: [Qemu-devel] [PATCH 1/6] virtio: introduce virtio_map |
Date: |
Tue, 27 Oct 2015 20:38:15 +0200 |
On Tue, Oct 27, 2015 at 04:13:12PM +0000, Stefan Hajnoczi wrote:
> On Tue, Oct 27, 2015 at 10:47:56AM +0200, Michael S. Tsirkin wrote:
> > + for (i = 0; i < *num_sg; i++) {
> > len = sg[i].iov_len;
> > sg[i].iov_base = cpu_physical_memory_map(addr[i], &len, is_write);
> > - if (sg[i].iov_base == NULL || len != sg[i].iov_len) {
> > + if (!sg[i].iov_base) {
> > error_report("virtio: error trying to map MMIO memory");
> > exit(1);
> > }
> > + if (len == sg[i].iov_len) {
> > + continue;
> > + }
> > + if (*num_sg >= max_size) {
> > + error_report("virtio: memory split makes iovec too large");
> > + exit(1);
> > + }
> > + memcpy(sg + i + 1, sg + i, sizeof(*sg) * (*num_sg - i));
> > + memcpy(addr + i + 1, addr + i, sizeof(*addr) * (*num_sg - i));
>
> These should be memmove() since memcpy() arguments are not allowed to overlap.
Oh right. Will fix, thanks!