Re: [libvirt] [PATCH] cgroup: cleanup eventParams when virTypedParamsAddULLong failed
On 9/19/19 10:02 AM, Xu Yandong wrote:
Function virTypedParamsAddULLong use realloc to gain memory,
and doesn't free it when failed. so we need free eventParams to
prevent a memory leak.
Signed-off-by: Xu Yandong <xuyandong2(a)huawei.com>
---
src/qemu/qemu_cgroup.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/src/qemu/qemu_cgroup.c b/src/qemu/qemu_cgroup.c
index ecd96efb0a..bc498e4b10 100644
--- a/src/qemu/qemu_cgroup.c
+++ b/src/qemu/qemu_cgroup.c
@@ -869,8 +869,11 @@ qemuSetupCpuCgroup(virDomainObjPtr vm)
if (virTypedParamsAddULLong(&eventParams, &eventNparams,
&eventMaxparams,
VIR_DOMAIN_TUNABLE_CPU_CPU_SHARES,
- val) < 0)
+ val) < 0) {
+ if (eventParams)
This check seems needless.
+ virTypedParamsFree(eventParams, eventNparams);
return -1;
+ }
event = virDomainEventTunableNewFromObj(vm, eventParams, eventNparams);
}
Have you actually seen a leak here or was this just found via code
investigation?
Because the only way that virTypedParamsAddULLong() can fail is if
VIR_RESIZE_N() called inside it fails at which point it doesn't allocate
any new memory.
Michal