[PATCH libvirt v1 1/6] conf: fix ZPCI address validation on s390

[Shalini Chellathurai Saroja <shalini@xxxxxxxxxxxxx>]

Currently, there are two issues with handling the ZPCI address
extension. Firstly, when the uid is to be auto-generated with a
specified fid, .i.e.:

    ...
    <address type='pci'>
        <zpci fid='0x0000001f'/>
    </address>
    ...

we expect uid='0x0001' (or the next available uid for the domain).
However, we get a parsing error:

    $ virsh define zpci.xml
    error: XML error: Invalid PCI address uid='0x0000', must be > 0x0000
    and <= 0xffff

Secondly, when the uid is specified explicitly with the invalid
numerical value '0x0000', we actually expect the parsing error above.
However, the domain is being defined and the uid value is silently
changed to a valid value.

The first issue is a bug and the second one is undesired behaviour, and
both issues are related to how we (in-band) signal invalid values for
uid and fid. So let's fix the XML parsing to do validation based on what
is actually specified in the XML and in later code assume that invalid
numerical values mean that they have been unspecified.

Signed-off-by: Bjoern Walk <bwalk@xxxxxxxxxxxxx>
Signed-off-by: Boris Fiuczynski <fiuczy@xxxxxxxxxxxxx>
Signed-off-by: Shalini Chellathurai Saroja <shalini@xxxxxxxxxxxxx>
Reviewed-by: Bjoern Walk <bwalk@xxxxxxxxxxxxx>
Reviewed-by: Boris Fiuczynski <fiuczy@xxxxxxxxxxxxx>
---
 src/conf/device_conf.c | 38 +++++++++++++++++---------------------
 1 file changed, 17 insertions(+), 21 deletions(-)

diff --git a/src/conf/device_conf.c b/src/conf/device_conf.c
index 4dbd5c1a..001ed929 100644
--- a/src/conf/device_conf.c
+++ b/src/conf/device_conf.c
@@ -53,38 +53,34 @@ virZPCIDeviceAddressParseXML(xmlNodePtr node,
                              virPCIDeviceAddressPtr addr)
 {
     virZPCIDeviceAddress def = { 0 };
-    char *uid;
-    char *fid;
-    int ret = -1;
+    g_autofree char *uid = NULL;
+    g_autofree char *fid = NULL;
 
     uid = virXMLPropString(node, "uid");
     fid = virXMLPropString(node, "fid");
 
-    if (uid &&
-        virStrToLong_uip(uid, NULL, 0, &def.uid) < 0) {
-        virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
-                       _("Cannot parse <address> 'uid' attribute"));
-        goto cleanup;
+    if (uid) {
+        if (virStrToLong_uip(uid, NULL, 0, &def.uid) < 0) {
+            virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
+                           _("Cannot parse <address> 'uid' attribute"));
+            return -1;
+        }
+        if (!virZPCIDeviceAddressIsValid(&def))
+            return -1;
     }
 
-    if (fid &&
-        virStrToLong_uip(fid, NULL, 0, &def.fid) < 0) {
-        virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
-                       _("Cannot parse <address> 'fid' attribute"));
-        goto cleanup;
+    if (fid) {
+        if (virStrToLong_uip(fid, NULL, 0, &def.fid) < 0) {
+            virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
+                           _("Cannot parse <address> 'fid' attribute"));
+            return -1;
+        }
     }
 
-    if (!virZPCIDeviceAddressIsEmpty(&def) &&
-        !virZPCIDeviceAddressIsValid(&def))
-        goto cleanup;
 
     addr->zpci = def;
-    ret = 0;
 
- cleanup:
-    VIR_FREE(uid);
-    VIR_FREE(fid);
-    return ret;
+    return 0;
 }
 
 void
-- 
2.21.1