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cadence_gem: switch to use qemu_receive_packet() for loopback

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Fix CVE-2021-3416

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: Alexander Bulekov <alxndr@bu.edu>
Signed-off-by: Jason Wang <jasowang@redhat.com>

Signed-off-by: Jiajie Li <lijiajie11@huawei.com>
This commit is contained in:
Chen Qun 2021-05-14 10:39:58 +08:00
parent 933ce84b06
commit 0ab1ee42ce
1 changed files with 44 additions and 0 deletions
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cadence_gem-switch-to-use-qemu_receive_packet-for-lo.patch Normal file
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@ -0,0 +1,44 @@
From 22aa1e5315508da1ce8ec4565bbf2e525e79c6c2 Mon Sep 17 00:00:00 2001
From: Alexander Bulekov <alxndr@bu.edu>
Date: Fri, 14 May 2021 10:39:58 +0800
Subject: [PATCH] cadence_gem: switch to use qemu_receive_packet() for loopback
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
Fix CVE-2021-3416
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: Alexander Bulekov <alxndr@bu.edu>
Signed-off-by: Jason Wang <jasowang@redhat.com>
Signed-off-by: Jiajie Li <lijiajie11@huawei.com>
---
hw/net/cadence_gem.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/hw/net/cadence_gem.c b/hw/net/cadence_gem.c
index d412085884..52205f36be 100644
--- a/hw/net/cadence_gem.c
+++ b/hw/net/cadence_gem.c
@@ -1221,8 +1221,8 @@ static void gem_transmit(CadenceGEMState *s)
/* Send the packet somewhere */
if (s->phy_loop || (s->regs[GEM_NWCTRL] &
GEM_NWCTRL_LOCALLOOP)) {
- gem_receive(qemu_get_queue(s->nic), tx_packet,
- total_bytes);
+ qemu_receive_packet(qemu_get_queue(s->nic), tx_packet,
+ total_bytes);
} else {
qemu_send_packet(qemu_get_queue(s->nic), tx_packet,
total_bytes);
--
2.27.0