[libvirt] [PATCH] conf: resctrl object is not properly handled
resctrl object stored in def->resctrls is shared by cachetune and memorytune. The domain xml configuration is parsed firstly for cachetune then memorytune, and the resctrl object will not be created in parsing settings for memorytune once it found sharing exists. But resctrl is improperly freed when sharing happens. Signed-off-by: Wang Huaqiang <huaqiang.wang@intel.com> --- src/conf/domain_conf.c | 12 +++++------- tests/genericxml2xmlindata/memorytune.xml | 4 ++++ 2 files changed, 9 insertions(+), 7 deletions(-) diff --git a/src/conf/domain_conf.c b/src/conf/domain_conf.c index 617ccac..604e006 100644 --- a/src/conf/domain_conf.c +++ b/src/conf/domain_conf.c @@ -19590,7 +19590,6 @@ virDomainMemorytuneDefParse(virDomainDefPtr def, VIR_AUTOUNREF(virResctrlAllocPtr) alloc = NULL; ssize_t i = 0; int n; - int ret = -1; ctxt->node = node; @@ -19632,14 +19631,13 @@ virDomainMemorytuneDefParse(virDomainDefPtr def, if (!(resctrl = virDomainResctrlNew(node, alloc, vcpus, flags))) return -1; - if (VIR_APPEND_ELEMENT(def->resctrls, def->nresctrls, resctrl) < 0) - goto cleanup; + if (VIR_APPEND_ELEMENT(def->resctrls, def->nresctrls, resctrl) < 0) { + virDomainResctrlDefFree(resctrl); + return -1; + } } - ret = 0; - cleanup: - virDomainResctrlDefFree(resctrl); - return ret; + return 0; } diff --git a/tests/genericxml2xmlindata/memorytune.xml b/tests/genericxml2xmlindata/memorytune.xml index ea03e22..7486b54 100644 --- a/tests/genericxml2xmlindata/memorytune.xml +++ b/tests/genericxml2xmlindata/memorytune.xml @@ -5,6 +5,10 @@ <currentMemory unit='KiB'>219136</currentMemory> <vcpu placement='static'>4</vcpu> <cputune> + <cachetune vcpus='0-1'> + <cache id='0' level='3' type='both' size='768' unit='KiB'/> + <cache id='1' level='3' type='both' size='768' unit='KiB'/> + </cachetune> <memorytune vcpus='0-1'> <node id='0' bandwidth='20'/> <node id='1' bandwidth='30'/> -- 2.7.4
On 8/20/19 7:06 AM, Wang Huaqiang wrote:
resctrl object stored in def->resctrls is shared by cachetune and memorytune. The domain xml configuration is parsed firstly for cachetune then memorytune, and the resctrl object will not be created in parsing settings for memorytune once it found sharing exists.
But resctrl is improperly freed when sharing happens.
Signed-off-by: Wang Huaqiang <huaqiang.wang@intel.com> --- src/conf/domain_conf.c | 12 +++++------- tests/genericxml2xmlindata/memorytune.xml | 4 ++++ 2 files changed, 9 insertions(+), 7 deletions(-)
diff --git a/src/conf/domain_conf.c b/src/conf/domain_conf.c index 617ccac..604e006 100644 --- a/src/conf/domain_conf.c +++ b/src/conf/domain_conf.c @@ -19590,7 +19590,6 @@ virDomainMemorytuneDefParse(virDomainDefPtr def, VIR_AUTOUNREF(virResctrlAllocPtr) alloc = NULL; ssize_t i = 0; int n; - int ret = -1;
ctxt->node = node;
@@ -19632,14 +19631,13 @@ virDomainMemorytuneDefParse(virDomainDefPtr def, if (!(resctrl = virDomainResctrlNew(node, alloc, vcpus, flags))) return -1;
- if (VIR_APPEND_ELEMENT(def->resctrls, def->nresctrls, resctrl) < 0) - goto cleanup; + if (VIR_APPEND_ELEMENT(def->resctrls, def->nresctrls, resctrl) < 0) { + virDomainResctrlDefFree(resctrl); + return -1; + } }
- ret = 0; - cleanup: - virDomainResctrlDefFree(resctrl); - return ret; + return 0; }
This could also be fixed by putting the free into a conditional: if (resctrl) virDomainRescrtlDefFree(resctrl); But I appreciate one less 'goto' jump to worry about. Reviewed-by: Daniel Henrique Barboza <danielhb413@gmail.com>
diff --git a/tests/genericxml2xmlindata/memorytune.xml b/tests/genericxml2xmlindata/memorytune.xml index ea03e22..7486b54 100644 --- a/tests/genericxml2xmlindata/memorytune.xml +++ b/tests/genericxml2xmlindata/memorytune.xml @@ -5,6 +5,10 @@ <currentMemory unit='KiB'>219136</currentMemory> <vcpu placement='static'>4</vcpu> <cputune> + <cachetune vcpus='0-1'> + <cache id='0' level='3' type='both' size='768' unit='KiB'/> + <cache id='1' level='3' type='both' size='768' unit='KiB'/> + </cachetune> <memorytune vcpus='0-1'> <node id='0' bandwidth='20'/> <node id='1' bandwidth='30'/>
On 8/20/19 3:18 PM, Daniel Henrique Barboza wrote:
On 8/20/19 7:06 AM, Wang Huaqiang wrote:
resctrl object stored in def->resctrls is shared by cachetune and memorytune. The domain xml configuration is parsed firstly for cachetune then memorytune, and the resctrl object will not be created in parsing settings for memorytune once it found sharing exists.
But resctrl is improperly freed when sharing happens.
Signed-off-by: Wang Huaqiang <huaqiang.wang@intel.com> --- src/conf/domain_conf.c | 12 +++++------- tests/genericxml2xmlindata/memorytune.xml | 4 ++++ 2 files changed, 9 insertions(+), 7 deletions(-)
diff --git a/src/conf/domain_conf.c b/src/conf/domain_conf.c index 617ccac..604e006 100644 --- a/src/conf/domain_conf.c +++ b/src/conf/domain_conf.c @@ -19590,7 +19590,6 @@ virDomainMemorytuneDefParse(virDomainDefPtr def, VIR_AUTOUNREF(virResctrlAllocPtr) alloc = NULL; ssize_t i = 0; int n; - int ret = -1; ctxt->node = node; @@ -19632,14 +19631,13 @@ virDomainMemorytuneDefParse(virDomainDefPtr def, if (!(resctrl = virDomainResctrlNew(node, alloc, vcpus, flags))) return -1; - if (VIR_APPEND_ELEMENT(def->resctrls, def->nresctrls, resctrl) < 0) - goto cleanup; + if (VIR_APPEND_ELEMENT(def->resctrls, def->nresctrls, resctrl) < 0) { + virDomainResctrlDefFree(resctrl); + return -1; + } } - ret = 0; - cleanup: - virDomainResctrlDefFree(resctrl); - return ret; + return 0; }
This could also be fixed by putting the free into a conditional:
if (resctrl) virDomainRescrtlDefFree(resctrl);
Not really. We want to free @resctrl only if it's a newly allocated struct. In case the pointer was obtained via virDomainResctrlVcpuMatch() then we must not free it (even though it is not NULL). Reviewed-by: Michal Privoznik <mprivozn@redhat.com> And pushed. Thanks for fixing this. Michal
participants (3)
-
Daniel Henrique Barboza -
Michal Privoznik -
Wang Huaqiang