On 8 September 2017 at 11:35, David Gibson <da...@gibson.dropbear.id.au> wrote:
> From: Daniel Henrique Barboza <danie...@linux.vnet.ibm.com>
>
> The sPAPR machine isn't clearing up the pending events QTAILQ on
> machine reboot. This allows for unprocessed hotplug/epow events
> to persist in the queue after reset and, when reasserting the IRQs in
> check_exception later on, these will be being processed by the OS.
>
> This patch implements a new function called 'spapr_clear_pending_events'
> that clears up the pending_events QTAILQ. This helper is then called
> inside ppc_spapr_reset to clear up the events queue, preventing
> old/deprecated events from persisting after a reset.
>
> Signed-off-by: Daniel Henrique Barboza <danie...@linux.vnet.ibm.com>
> Signed-off-by: David Gibson <da...@gibson.dropbear.id.au>
> +void spapr_clear_pending_events(sPAPRMachineState *spapr)
> +{
> + sPAPREventLogEntry *entry = NULL;
> +
> + QTAILQ_FOREACH(entry, &spapr->pending_events, next) {
> + QTAILQ_REMOVE(&spapr->pending_events, entry, next);
> + g_free(entry->extended_log);
> + g_free(entry);
> + }
> +}
Coverity points out that this is a use-after-free error,
because QTAILQ_FOREACH will access the list pointers of
entry after the loop body has freed it. You want
QTAILQ_FOREACH_SAFE, I think. (CID 1381017)
thanks
-- PMM
