e1000: fix tx re-entrancy problem

The fact that the MMIO handler is not re-entrant causes an infinite
loop under certain conditions:

Guest write to TDT ->  Loopback -> RX (DMA to TDT) -> TX

We now eliminate the effect of this problem locally in e1000, by adding
a boolean in struct E1000State indicating when the TX side is busy. This
will cause any entering new call to return early instead of interfering
with the ongoing work, and eliminates any risk of looping.

This is intended to address CVE-2021-20257.

Signed-off-by: Jon Maloy <jmaloy@redhat.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>

hw/net/e1000.c

@@ -107,6 +107,7 @@ struct E1000State_st {
         e1000x_txd_props props;
         e1000x_txd_props tso_props;
         uint16_t tso_frames;
+        bool busy;
     } tx;
 
     struct {
@@ -763,6 +764,11 @@ start_xmit(E1000State *s)
         return;
     }
 
+    if (s->tx.busy) {
+        return;
+    }
+    s->tx.busy = true;
+
     while (s->mac_reg[TDH] != s->mac_reg[TDT]) {
         base = tx_desc_base(s) +
                sizeof(struct e1000_tx_desc) * s->mac_reg[TDH];
@@ -789,6 +795,7 @@ start_xmit(E1000State *s)
             break;
         }
     }
+    s->tx.busy = false;
     set_ics(s, 0, cause);
 }