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From 0ebce8809c6cf12e4df5fe9fdf441b280176412e Mon Sep 17 00:00:00 2001
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From: Gerd Hoffmann <kraxel@redhat.com>
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Date: Tue, 18 Nov 2014 11:42:20 +0100
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Subject: [PATCH 1/5] xhci: add sanity checks to xhci_lookup_uport
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Message-id: <1416310940-10391-2-git-send-email-kraxel@redhat.com>
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Patchwork-id: 62418
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O-Subject: [RHEL-7.1 qemu-kvm PATCH v2 1/1] xhci: add sanity checks to xhci_lookup_uport
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Bugzilla: 1074219
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RH-Acked-by: Dr. David Alan Gilbert (git) <dgilbert@redhat.com>
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RH-Acked-by: Marcel Apfelbaum <marcel.a@redhat.com>
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RH-Acked-by: Markus Armbruster <armbru@redhat.com>
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Also catch xhci_lookup_uport failures in post_load.
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Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
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(cherry picked from commit f2ad97ff81da51c064b9e87720ff48a0874f45d4)
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Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>
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---
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hw/usb/hcd-xhci.c | 9 +++++++++
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1 file changed, 9 insertions(+)
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diff --git a/hw/usb/hcd-xhci.c b/hw/usb/hcd-xhci.c
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index 32568cb..ce81632 100644
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--- a/hw/usb/hcd-xhci.c
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+++ b/hw/usb/hcd-xhci.c
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@@ -2254,6 +2254,9 @@ static USBPort *xhci_lookup_uport(XHCIState *xhci, uint32_t *slot_ctx)
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int i, pos, port;
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port = (slot_ctx[1]>>16) & 0xFF;
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+ if (port < 1 || port > xhci->numports) {
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+ return NULL;
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+ }
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port = xhci->ports[port-1].uport->index+1;
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pos = snprintf(path, sizeof(path), "%d", port);
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for (i = 0; i < 5; i++) {
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@@ -3637,6 +3640,12 @@ static int usb_xhci_post_load(void *opaque, int version_id)
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xhci_mask64(ldq_le_pci_dma(pci_dev, dcbaap + 8 * slotid));
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xhci_dma_read_u32s(xhci, slot->ctx, slot_ctx, sizeof(slot_ctx));
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slot->uport = xhci_lookup_uport(xhci, slot_ctx);
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+ if (!slot->uport) {
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+ /* should not happen, but may trigger on guest bugs */
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+ slot->enabled = 0;
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+ slot->addressed = 0;
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+ continue;
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+ }
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assert(slot->uport && slot->uport->dev);
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for (epid = 1; epid <= 31; epid++) {
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--
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1.8.3.1
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