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由 Michal Privoznik 提交于
Currently, if there's an error opening /dev/vhost-net (e.g. because it doesn't exist) but it's not required we proceed with vhostfd array filled with -1 and vhostfdSize unchanged. Later, when constructing the qemu command line only non-negative items within vhostfd array are taken into account. This means, vhostfdSize may be greater than the actual count of non-negative items in vhostfd array. This results in improper command line arguments being generated, e.g.: -netdev tap,fd=21,id=hostnet0,vhost=on,vhostfd=(null)
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