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virtio-net: Fix lduw_p() pointer argument of wrong size 

A pointer to a size_t variable was passed as the void * pointer to
lduw_p() in virtio_net_receive().  Instead of acting on the 16-bit value
this caused failure on big-endian hosts.

Avoid this issue in the future by using stw_p() instead.  In general we
should use ld*_p() for loading from target memory and st*_p() for
storing to target memory anyway, not the other way around.

Also tighten up a correct use of lduw_p() when stw_p() should be used
instead in virtio_net_get_config().

Signed-off-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
(cherry picked from commit b46d97f2d2)
This commit is contained in:
Stefan Hajnoczi 2011-03-03 21:42:28 +00:00 committed by Aurelien Jarno
parent cdd8152e56
commit 4b35dfea68
1 changed files with 2 additions and 2 deletions
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4
hw/virtio-net.c
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@ -79,7 +79,7 @@ static void virtio_net_get_config(VirtIODevice *vdev, uint8_t *config)
VirtIONet *n = to_virtio_net(vdev);
struct virtio_net_config netcfg;
netcfg.status = lduw_p(&n->status);
stw_p(&netcfg.status, n->status);
memcpy(netcfg.mac, n->mac, ETH_ALEN);
memcpy(config, &netcfg, sizeof(netcfg));
}
@ -678,7 +678,7 @@ static ssize_t virtio_net_receive(VLANClientState *nc, const uint8_t *buf, size_
}
if (mhdr) {
mhdr->num_buffers = lduw_p(&i);
stw_p(&mhdr->num_buffers, i);
}
virtqueue_flush(n->rx_vq, i);