From 20ee78bf9bafe542097fe0e144921d001a6799a7 Mon Sep 17 00:00:00 2001
From: Peter Krempa <pkrempa@redhat.com>
Date: Wed, 29 Mar 2017 16:56:05 +0200
Subject: [PATCH] qemu: domain: Properly lookup top of chain in
 qemuDomainGetStorageSourceByDevstr

When idx is 0 virStorageFileChainLookup returns the base (bottom) of the
backing chain rather than the top. This is expected by the callers of
qemuDomainGetStorageSourceByDevstr.

Add a special case for idx == 0
---
 src/qemu/qemu_domain.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/src/qemu/qemu_domain.c b/src/qemu/qemu_domain.c
index 458bb5f9a4..589eb18899 100644
--- a/src/qemu/qemu_domain.c
+++ b/src/qemu/qemu_domain.c
@@ -8605,7 +8605,10 @@ qemuDomainGetStorageSourceByDevstr(const char *devstr,
         goto cleanup;
     }
 
-    src = virStorageFileChainLookup(disk->src, NULL, NULL, idx, NULL);
+    if (idx == 0)
+        src = disk->src;
+    else
+        src = virStorageFileChainLookup(disk->src, NULL, NULL, idx, NULL);
 
  cleanup:
     VIR_FREE(target);