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msf2-mac: switch to use qemu_receive_packet() for loopback

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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 13:00:01 +08:00
parent 331d2ac9ea
commit 26194a58f4
1 changed files with 1 additions and 1 deletions
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2
hw/net/msf2-emac.c
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@ -158,7 +158,7 @@ static void msf2_dma_tx(MSF2EmacState *s)
* R_CFG1 bit 0 is set. * R_CFG1 bit 0 is set.
*/ */
if (s->regs[R_CFG1] & R_CFG1_LB_EN_MASK) { if (s->regs[R_CFG1] & R_CFG1_LB_EN_MASK) {
nc->info->receive(nc, buf, size); qemu_receive_packet(nc, buf, size);
} else { } else {
qemu_send_packet(nc, buf, size); qemu_send_packet(nc, buf, size);
} }