[libvirt] [PATCH] qemu_capabilities: Use proper free function for caps->cpuModels

[Jiri Denemark]

On Mon, Nov 25, 2019 at 16:41:33 +0100, Michal Privoznik wrote:
> The cpuModels member of _virQEMUCapsAccel struct is not a
> virObject but regular struct with a free function defined:
> qemuMonitorCPUDefsFree(). Use that when clearing parent structure
> instead of virObjectUnref() to avoid a memleak:
> 
> ==212322== 57,275 (48 direct, 57,227 indirect) bytes in 3 blocks are definitely lost in loss record 623 of 627
> ==212322==    at 0x4838B86: calloc (vg_replace_malloc.c:762)
> ==212322==    by 0x554A158: g_malloc0 (in /usr/lib64/libglib-2.0.so.0.6000.6)
> ==212322==    by 0x17B14BF5: qemuMonitorCPUDefsNew (qemu_monitor.c:3587)
> ==212322==    by 0x17B27BA7: qemuMonitorJSONGetCPUDefinitions (qemu_monitor_json.c:5616)
> ==212322==    by 0x17B14B0B: qemuMonitorGetCPUDefinitions (qemu_monitor.c:3559)
> ==212322==    by 0x17A6AFBB: virQEMUCapsFetchCPUDefinitions (qemu_capabilities.c:2571)
> ==212322==    by 0x17A6B2CC: virQEMUCapsProbeQMPCPUDefinitions (qemu_capabilities.c:2629)
> ==212322==    by 0x17A70C00: virQEMUCapsInitQMPMonitorTCG (qemu_capabilities.c:4769)
> ==212322==    by 0x17A70DDF: virQEMUCapsInitQMPSingle (qemu_capabilities.c:4820)
> ==212322==    by 0x17A70E99: virQEMUCapsInitQMP (qemu_capabilities.c:4848)
> ==212322==    by 0x17A71044: virQEMUCapsNewForBinaryInternal (qemu_capabilities.c:4891)
> ==212322==    by 0x17A7119C: virQEMUCapsNewData (qemu_capabilities.c:4923)
> 
> Signed-off-by: Michal Privoznik <mprivozn at redhat.com>
> ---
>  src/qemu/qemu_capabilities.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/src/qemu/qemu_capabilities.c b/src/qemu/qemu_capabilities.c
> index e5f19ddcaa..f65af5c228 100644
> --- a/src/qemu/qemu_capabilities.c
> +++ b/src/qemu/qemu_capabilities.c
> @@ -1798,7 +1798,7 @@ virQEMUCapsAccelClear(virQEMUCapsAccelPtr caps)
>      VIR_FREE(caps->machineTypes);
>  
>      virQEMUCapsHostCPUDataClear(&caps->hostCPU);
> -    virObjectUnref(caps->cpuModels);
> +    qemuMonitorCPUDefsFree(caps->cpuModels);
>  }

Oops, introduced by v5.9.0-318-gbc0b22884a which switched cpuModels from
virDomainCapsCPUModelsPtr (virObject) to qemuMonitorCPUDefsPtr.
Unfortunately, virObjectUnref takes void * so the compiler could not
help here.

Reviewed-by: Jiri Denemark <jdenemar at redhat.com>