qemu: fix CVE-2020-25723

Signed-off-by: Lee Chee Yang <[email protected]>
Signed-off-by: Steve Sakoman <[email protected]>

meta/recipes-devtools/qemu/qemu.inc

@@ -51,6 +51,7 @@ SRC_URI = "https://download.qemu.org/${BPN}-${PV}.tar.xz \
 	   file://0001-target-mips-Increase-number-of-TLB-entries-on-the-34.patch \
 	   file://CVE-2019-20175.patch \
 	   file://CVE-2020-24352.patch \
+	   file://CVE-2020-25723.patch \
 	   "
 UPSTREAM_CHECK_REGEX = "qemu-(?P<pver>\d+(\.\d+)+)\.tar"
 

meta/recipes-devtools/qemu/qemu/CVE-2020-25723.patch

@@ -0,0 +1,52 @@
+From 2fdb42d840400d58f2e706ecca82c142b97bcbd6 Mon Sep 17 00:00:00 2001
+From: Li Qiang <[email protected]>
+Date: Wed, 12 Aug 2020 09:17:27 -0700
+Subject: [PATCH] hw: ehci: check return value of 'usb_packet_map'
+
+If 'usb_packet_map' fails, we should stop to process the usb
+request.
+
+Signed-off-by: Li Qiang <[email protected]>
+Message-Id: <[email protected]>
+Signed-off-by: Gerd Hoffmann <[email protected]>
+
+
+Upstream-Status: Backport [https://git.qemu.org/?p=qemu.git;a=commit;h=2fdb42d840400d58f2e706ecca82c142b97bcbd6]
+CVE: CVE-2020-25723
+Signed-off-by: Chee Yang Lee <[email protected]>
+
+---
+ hw/usb/hcd-ehci.c | 10 ++++++++--
+ 1 file changed, 8 insertions(+), 2 deletions(-)
+
+diff --git a/hw/usb/hcd-ehci.c b/hw/usb/hcd-ehci.c
+index 58cceac..4da446d 100644
+--- a/hw/usb/hcd-ehci.c
++++ b/hw/usb/hcd-ehci.c
+@@ -1373,7 +1373,10 @@ static int ehci_execute(EHCIPacket *p, const char *action)
+         spd = (p->pid == USB_TOKEN_IN && NLPTR_TBIT(p->qtd.altnext) == 0);
+         usb_packet_setup(&p->packet, p->pid, ep, 0, p->qtdaddr, spd,
+                          (p->qtd.token & QTD_TOKEN_IOC) != 0);
+-        usb_packet_map(&p->packet, &p->sgl);
++        if (usb_packet_map(&p->packet, &p->sgl)) {
++            qemu_sglist_destroy(&p->sgl);
++            return -1;
++        }
+         p->async = EHCI_ASYNC_INITIALIZED;
+     }
+
+@@ -1453,7 +1456,10 @@ static int ehci_process_itd(EHCIState *ehci,
+             if (ep && ep->type == USB_ENDPOINT_XFER_ISOC) {
+                 usb_packet_setup(&ehci->ipacket, pid, ep, 0, addr, false,
+                                  (itd->transact[i] & ITD_XACT_IOC) != 0);
+-                usb_packet_map(&ehci->ipacket, &ehci->isgl);
++                if (usb_packet_map(&ehci->ipacket, &ehci->isgl)) {
++                    qemu_sglist_destroy(&ehci->isgl);
++                    return -1;
++                }
+                 usb_handle_packet(dev, &ehci->ipacket);
+                 usb_packet_unmap(&ehci->ipacket, &ehci->isgl);
+             } else {
+-- 
+1.8.3.1
+