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[libvirt] [PATCH] qemu: Fix crash in tunnelled migration

Any attempt to start a tunnelled migration with libvirtd that supports
RDMA migration (specifically commit v1.2.8-226-ged22a47) crashes
libvirtd on the destination host.

The crash is inevitable because qemuMigrationPrepareAny is always called
with NULL protocol in case of tunnelled migration.

Signed-off-by: Jiri Denemark <jdenemar redhat com>
 src/qemu/qemu_migration.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/qemu/qemu_migration.c b/src/qemu/qemu_migration.c
index 100600e..89313df 100644
--- a/src/qemu/qemu_migration.c
+++ b/src/qemu/qemu_migration.c
@@ -2707,7 +2707,7 @@ qemuMigrationPrepareAny(virQEMUDriverPtr driver,
         goto cleanup;
-    if (STREQ(protocol, "rdma") && !vm->def->mem.hard_limit) {
+    if (STREQ_NULLABLE(protocol, "rdma") && !vm->def->mem.hard_limit) {
         virReportError(VIR_ERR_OPERATION_INVALID, "%s",
                        _("cannot start RDMA migration with no memory hard "
                          "limit set"));

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