[PATCH] libxl: Free data returned from libxl_userdata_retrieve

[Michal Prívozník]

On 11/10/21 12:34 AM, Jim Fehlig wrote:
> Found via valgrind
> 
> ==15016== 3,701 bytes in 2 blocks are definitely lost in loss record 975 of 1,009
> ==15016==    at 0x4C2A2AF: malloc (in /usr/lib64/valgrind/vgpreload_memcheck-amd64-linux.so)
> ==15016==    by 0x1FCD30CB: libxl_read_file_contents (in /usr/lib64/libxenlight.so.4.12.0)
> ==15016==    by 0x1FCCA58A: ??? (in /usr/lib64/libxenlight.so.4.12.0)
> ==15016==    by 0x1FCCA6C2: libxl_userdata_retrieve (in /usr/lib64/libxenlight.so.4.12.0)
> ==15016==    by 0x1FA42A5A: libxlReconnectDomain (libxl_driver.c:394)
> ==15016==    by 0x53BAC99: virDomainObjListHelper (virdomainobjlist.c:802)
> ==15016==    by 0x530842F: virHashForEach (virhash.c:575)
> ==15016==    by 0x53BC0E0: virDomainObjListForEach (virdomainobjlist.c:817)
> ==15016==    by 0x1FA423C4: libxlReconnectDomains (libxl_driver.c:468)
> ==15016==    by 0x1FA423C4: libxlStateInitialize (libxl_driver.c:778)
> ==15016==    by 0x54E8E9E: virStateInitialize (libvirt.c:657)
> ==15016==    by 0x12DBFA: daemonRunStateInit (remote_daemon.c:797)
> ==15016==    by 0x535BF79: virThreadHelper (virthread.c:206)
> 
> Signed-off-by: Jim Fehlig <jfehlig at suse.com>
> ---
>  src/libxl/libxl_driver.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/src/libxl/libxl_driver.c b/src/libxl/libxl_driver.c
> index 7ea157f9c4..1a9bf8f186 100644
> --- a/src/libxl/libxl_driver.c
> +++ b/src/libxl/libxl_driver.c
> @@ -461,6 +461,7 @@ libxlReconnectDomain(virDomainObj *vm,
>  
>   cleanup:
>      libxl_dominfo_dispose(&d_info);
> +    VIR_FREE(data);
>      virObjectUnlock(vm);
>      virObjectUnref(vm);
>      virObjectUnref(cfg);
> 

Alternatively, data can be declared as g_autofree:

    g_autofree uint8_t *data = NULL;

Regardless of what to decide to go with:

Reviewed-by: Michal Privoznik <mprivozn at redhat.com>

Michal