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[Qemu-devel] [PATCH 106/108] vmstate_xhci_event: fix unterminated field

From: Michael Roth
Subject: [Qemu-devel] [PATCH 106/108] vmstate_xhci_event: fix unterminated field list
Date: Wed, 6 Aug 2014 15:39:56 -0500

From: Laszlo Ersek <address@hidden>

"vmstate_xhci_event" was introduced in commit 37352df3 ("xhci: add live
migration support"), and first released in v1.6.0. The field list in this
VMSD is not terminated with the VMSTATE_END_OF_LIST() macro.

During normal use (ie. migration), the issue is practically invisible,
because the "vmstate_xhci_event" object (with the unterminated field list)
is only ever referenced -- via "vmstate_xhci_intr" -- if xhci_er_full()
returns true, for the "ev_buffer" test. Since that field_exists() check
(apparently) almost always returns false, we almost never traverse
"vmstate_xhci_event" during migration, which hides the bug.

However, Amit's vmstate checker forces recursion into this VMSD as well,
and the lack of VMSTATE_END_OF_LIST() breaks the field list terminator
check (field->name != NULL) in dump_vmstate_vmsd(). The result is
undefined behavior, which in my case translates to infinite recursion
(because the loop happens to overflow into "vmstate_xhci_intr", which then
links back to "vmstate_xhci_event").

Add the missing terminator.

Signed-off-by: Laszlo Ersek <address@hidden>
Reviewed-by: Amit Shah <address@hidden>
Reviewed-by: Paolo Bonzini <address@hidden>
Cc: address@hidden
Signed-off-by: Peter Maydell <address@hidden>
(cherry picked from commit 3afca1d6d413592c2b78cf28f52fa24a586d8f56)
Signed-off-by: Michael Roth <address@hidden>
 hw/usb/hcd-xhci.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/hw/usb/hcd-xhci.c b/hw/usb/hcd-xhci.c
index ef3177a..0ceb10d 100644
--- a/hw/usb/hcd-xhci.c
+++ b/hw/usb/hcd-xhci.c
@@ -3703,6 +3703,7 @@ static const VMStateDescription vmstate_xhci_event = {
         VMSTATE_UINT32(flags,  XHCIEvent),
         VMSTATE_UINT8(slotid,  XHCIEvent),
         VMSTATE_UINT8(epid,    XHCIEvent),

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