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Re: [libvirt] [PATCH 3/3] util: storage: Improve error message when requesting image above 'start'

On Tue, Apr 21, 2015 at 05:52:14PM +0200, Peter Krempa wrote:
When a user would specify a backing chain index that is above the start
point libvirt would report a rather unhelpful error:

invalid argument: could not find backing store 1 in chain for 'sub/link2'

This patch adds an explicit check that the index is below start point in
the backing store and reports the following error if not:

invalid argument: requested backing store index 1 is above 'sub/../qcow2' in chain for 'sub/link2'

Resolves: https://bugzilla.redhat.com/show_bug.cgi?id=1177062
src/util/virstoragefile.c | 9 +++++++++
1 file changed, 9 insertions(+)

diff --git a/src/util/virstoragefile.c b/src/util/virstoragefile.c
index c9d3977..2a2f238 100644
--- a/src/util/virstoragefile.c
+++ b/src/util/virstoragefile.c
@@ -1341,6 +1341,15 @@ virStorageFileChainLookup(virStorageSourcePtr chain,
        *parent = startFrom;

+    if (idx && idx < i) {
+        virReportError(VIR_ERR_INVALID_ARG,
+                       _("requested backing store index %u is above '%s' "
+                         "in chain for '%s'"),
+                       idx, NULLSTR(startFrom->path), NULLSTR(start));

Possible crasher: startFrom can be NULL here, rather move the check
into the previous block where the parent is being set when found (idx
can't be < i when there is no startFrom anyway).  You can then avoid
cleaning up the *parent here -+
+        *parent = NULL;
+        return NULL;
+    }

ACK series with that fixed.

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