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libxl: Fix Coverity warning

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John Ferlan reported the following Coverity warning:

In libxlDomainCoreDump() Coverity has noted a FORWARD_NULL reference:

2004 	    if ((flags & VIR_DUMP_CRASH) && !vm->persistent) {
2005 	        virDomainObjListRemove(driver->domains, vm);

(20) Event assign_zero: 	Assigning: "vm" = "NULL".
Also see events: 	[var_deref_model]

2006 	        vm = NULL;
2007 	    }
2008
2009 	    ret = 0;
2010
2011 	cleanup_unpause:

(21) Event var_deref_model: 	Passing null pointer "vm" to function
     "virDomainObjIsActive(virDomainObjPtr)", which dereferences it. [details]
Also see events: 	[assign_zero]

2012 	    if (virDomainObjIsActive(vm) && paused) {
2013 	        if (libxl_domain_unpause(priv->ctx, dom->id) != 0) {
2014 	            virReportError(VIR_ERR_INTERNAL_ERROR,

Removing the vm from domain obj list and setting it to NULL can be
done in the previous 'if (flags & VIR_DUMP_CRASH)' conditional.  Fix
the Coverity warning by ensuring vm is not NULL before testing if it
is still active.
This commit is contained in:
Jim Fehlig committed 2013-09-04 15:32:24 -06:00
1 parent c021f5cecc
commit 5236aed83f
1 file changed
+5 -6
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src/libxl/libxl_driver.c
+5 -6
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@@ -1999,17 +1999,16 @@ libxlDomainCoreDump(virDomainPtr dom, const char *to, unsigned int flags)
event = virDomainEventNewFromObj(vm, VIR_DOMAIN_EVENT_STOPPED,
VIR_DOMAIN_EVENT_STOPPED_CRASHED);
}
if ((flags & VIR_DUMP_CRASH) && !vm->persistent) {
virDomainObjListRemove(driver->domains, vm);
vm = NULL;
if (!vm->persistent) {
virDomainObjListRemove(driver->domains, vm);
vm = NULL;
}
}
ret = 0;
cleanup_unpause:
if (virDomainObjIsActive(vm) && paused) {
if (vm && virDomainObjIsActive(vm) && paused) {
if (libxl_domain_unpause(priv->ctx, dom->id) != 0) {
virReportError(VIR_ERR_INTERNAL_ERROR,
_("After dumping core, failed to resume domain '%d' with"