qemu: fix CVE-2021-3416

Signed-off-by: Sakib Sajal <sakib.sajal@windriver.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

1 files changed, 43 insertions, 0 deletions

diff --git a/meta/recipes-devtools/qemu/qemu/CVE-2021-3416_3.patch b/meta/recipes-devtools/qemu/qemu/CVE-2021-3416_3.patch
new file mode 100644
index 0000000000..3fc469e3e3
--- /dev/null
+++ b/meta/recipes-devtools/qemu/qemu/CVE-2021-3416_3.patch
@@ -0,0 +1,43 @@
+From c041a4da1ff119715e0ccf2d4a7af62568f17b93 Mon Sep 17 00:00:00 2001
+From: Jason Wang <jasowang@redhat.com>
+Date: Wed, 24 Feb 2021 12:57:40 +0800
+Subject: [PATCH 03/10] dp8393x: switch to use qemu_receive_packet() for
+ loopback packet
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+
+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>
+
+Upstream-Status: Backport [331d2ac9ea307c990dc86e6493e8f0c48d14bb33]
+CVE: CVE-2021-3416
+
+Signed-off-by: Sakib Sajal <sakib.sajal@windriver.com>
+---
+ hw/net/dp8393x.c | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/hw/net/dp8393x.c b/hw/net/dp8393x.c
+index 205c0decc..533a8304d 100644
+--- a/hw/net/dp8393x.c
++++ b/hw/net/dp8393x.c
+@@ -506,7 +506,7 @@ static void dp8393x_do_transmit_packets(dp8393xState *s)
+             s->regs[SONIC_TCR] |= SONIC_TCR_CRSL;
+             if (nc->info->can_receive(nc)) {
+                 s->loopback_packet = 1;
+-                nc->info->receive(nc, s->tx_buffer, tx_len);
++                qemu_receive_packet(nc, s->tx_buffer, tx_len);
+             }
+         } else {
+             /* Transmit packet */
+-- 
+2.29.2
+