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e1000: switch to use qemu_receive_packet() for loopback 

This patch switches to use qemu_receive_packet() which can detect
reentrancy and return early.

This is intended to address CVE-2021-3416.

Cc: Prasad J Pandit <ppandit@redhat.com>
Cc: qemu-stable@nongnu.org
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>
This commit is contained in:
Jason Wang 2021-02-24 12:13:22 +08:00
parent 705df5466c
commit 1caff0340f
1 changed files with 1 additions and 1 deletions
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2
hw/net/e1000.c
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@ -546,7 +546,7 @@ e1000_send_packet(E1000State *s, const uint8_t *buf, int size)
NetClientState *nc = qemu_get_queue(s->nic);
if (s->phy_reg[PHY_CTRL] & MII_CR_LOOPBACK) {
nc->info->receive(nc, buf, size);
qemu_receive_packet(nc, buf, size);
} else {
qemu_send_packet(nc, buf, size);
}