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From 2fdb42d840400d58f2e706ecca82c142b97bcbd6 Mon Sep 17 00:00:00 2001
From: Li Qiang <liq3ea@163.com>
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 <liq3ea@163.com>
Message-Id: <20200812161727.29412-1-liq3ea@163.com>
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Upstream-Status: Backport
CVE: CVE-2020-25723
[https://git.qemu.org/?p=qemu.git;a=commit;h=2fdb42d840400d58f2e706ecca82c142b97bcbd6]
Signed-off-by: Li Wang <li.wang@windriver.com>
---
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 1495e8f..1fbb02a 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;
}
@@ -1452,7 +1455,10 @@ 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 {
--
2.17.1
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