Re: [libvirt] [PATCH] Memory Leak Fix: Check def->info->alias before assigning

On running the command make -C tests valgrind, there used to be a bunch of memory leaks shown by valgrind. Specifically, one can check it by running: libtool --mode=execute valgrind --quiet --leak-check=full --suppressions=./.valgrind.supp qemuhotplugtest The issue was that def->info->alias was already malloc'ed by xmlStrndup in virDomainDeviceInfoParseXML (domain_conf.c:3439). The new alias was being assigned again without freeing the old one in qemuAssignDeviceAliases(). This patch checks if the entity exists, and frees accordingly, hence making valgrind cry lesser. --- src/qemu/qemu_command.c | 39 +++++++++++++++++++++++++++++++++++++++ 1 file changed, 39 insertions(+) diff --git a/src/qemu/qemu_command.c b/src/qemu/qemu_command.c index 763417f..bbec1d4 100644 --- a/src/qemu/qemu_command.c +++ b/src/qemu/qemu_command.c @@ -979,6 +979,8 @@ qemuAssignDeviceAliases(virDomainDefPtr def, virQEMUCapsPtr qemuCaps) size_t i; for (i = 0; i < def->ndisks; i++) { + if (def->disks[i]->info.alias) + VIR_FREE(def->disks[i]->info.alias);