There's a bug in the implementation of libvirt_list_active_domains(). We try to return an array of names of active domains. So we iterate over array of domains as returned by libvirt and get each domain's name. But we don't obtain a duplicate of that name rather just a pointer into virDomain object. The very next thing we do is we free the virDomain object and then try to copy what's now invalid pointer. Reverse the order of those two actions. Signed-off-by: Michal Privoznik <mprivozn(a)redhat.com&gt; --- src/libvirt-php.c | 13 +++++-------- 1 file changed, 5 insertions(+), 8 deletions(-) diff --git a/src/libvirt-php.c b/src/libvirt-php.c index 2045c59..8edcb10 100644 --- a/src/libvirt-php.c +++ b/src/libvirt-php.c @@ -9128,18 +9128,15 @@ PHP_FUNCTION(libvirt_list_active_domains) domain=virDomainLookupByID(conn->conn,ids[i]); if (domain!=NULL) { - name=virDomainGetName(domain); - - if (virDomainFree (domain)) - resource_change_counter(INT_RESOURCE_DOMAIN, conn->conn, domain, 0 TSRMLS_CC); - - if (name==NULL) - { - efree (ids); + if (!(name = virDomainGetName(domain))) { + efree(ids); RETURN_FALSE; } VIRT_ADD_NEXT_INDEX_STRING(return_value, name); + + if (virDomainFree(domain)) + resource_change_counter(INT_RESOURCE_DOMAIN, conn->conn, domain, 0 TSRMLS_CC); } } efree(ids); -- 2.8.4