pcnet: fix Negative array index read
s->xmit_pos maybe assigned to a negative value (-1), but in this branch variable s->xmit_pos as an index to array s->buffer. Let's add a check for s->xmit_pos. Signed-off-by: NGonglei <arei.gonglei@huawei.com> Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com> Reviewed-by: NJason Wang <jasowang@redhat.com> Reviewed-by: NJason Wang <jasowang@redhat.com> Signed-off-by: NStefan Hajnoczi <stefanha@redhat.com>
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