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pcnet: 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
Buglink: https://bugs.launchpad.net/qemu/+bug/1917085
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com
Signed-off-by: Alexander Bulekov <alxndr@bu.edu>
Signed-off-by: Jason Wang <jasowang@redhat.com>
stable-6.0
Alexander Bulekov 2021-03-01 10:33:34 -05:00 committed by Jason Wang
parent 5311fb805a
commit 99ccfaa1ed
1 changed files with 1 additions and 1 deletions
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2
hw/net/pcnet.c
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@ -1250,7 +1250,7 @@ txagain:
if (BCR_SWSTYLE(s) == 1)
add_crc = !GET_FIELD(tmd.status, TMDS, NOFCS);
s->looptest = add_crc ? PCNET_LOOPTEST_CRC : PCNET_LOOPTEST_NOCRC;
pcnet_receive(qemu_get_queue(s->nic), s->buffer, s->xmit_pos);
qemu_receive_packet(qemu_get_queue(s->nic), s->buffer, s->xmit_pos);
s->looptest = 0;
} else {
if (s->nic) {