[PATCH] Libvirt: virTypedParamsValidate: Fix detection of multiple parameters

["Jason J. Herne" <jjherne@xxxxxxxxxxxxxxxxxx>]

virTypedParamsValidate currently uses an index based check to find
duplicate parameters. This check does not work. Consider the following
simple example:

We have only 2 keys
A  (multiples allowed)
B  (multiples NOT allowed)

We are given the following list of parameters to check:
A
A
B

If you work through the validation loop you will see that our last iteration
through the loop has i=2 and j=1. In this case, i > j and keys[j].value.i will
indicate that multiples are not allowed. Both conditionals are satisfied so
an incorrect error will be given: "parameter '%s' occurs multiple times"

This patch replaces the index based check with code that remembers
the name of the last parameter seen and only triggers the error case if
the current parameter name equals the last one. This works because the
list is sorted and duplicate parameters will be grouped together.

In reality, we hit this bug while using selective block migration to migrate
a guest with 5 disks. 5 was apparently just the right number to push i > j
and hit this bug.

virsh migrate --live guestname --copy-storage-all
              --migrate-disks vdb,vdc,vdd,vde,vdf
              qemu+ssh://dsthost/system

Signed-off-by: Jason J. Herne <jjherne@xxxxxxxxxxxxxxxxxx>
Reviewed-by: Eric Farman <farman@xxxxxxxxxxxxxxxxxx>
---
 src/util/virtypedparam.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/src/util/virtypedparam.c b/src/util/virtypedparam.c
index 138fc64..23109e1 100644
--- a/src/util/virtypedparam.c
+++ b/src/util/virtypedparam.c
@@ -66,7 +66,7 @@ virTypedParamsValidate(virTypedParameterPtr params, int nparams, ...)
     va_list ap;
     int ret = -1;
     size_t i, j;
-    const char *name;
+    const char *name, *last_name = NULL;
     int type;
     size_t nkeys = 0, nkeysalloc = 0;
     virTypedParameterPtr sorted = NULL, keys = NULL;
@@ -106,7 +106,8 @@ virTypedParamsValidate(virTypedParameterPtr params, int nparams, ...)
         if (STRNEQ(sorted[i].field, keys[j].field)) {
             j++;
         } else {
-            if (i > j && !(keys[j].value.i & VIR_TYPED_PARAM_MULTIPLE)) {
+            if (STREQ_NULLABLE(last_name, sorted[i].field) &&
+                !(keys[j].value.i & VIR_TYPED_PARAM_MULTIPLE)) {
                 virReportError(VIR_ERR_INVALID_ARG,
                                _("parameter '%s' occurs multiple times"),
                                sorted[i].field);
@@ -125,6 +126,7 @@ virTypedParamsValidate(virTypedParameterPtr params, int nparams, ...)
                                virTypedParameterTypeToString(keys[j].type));
                 goto cleanup;
             }
+            last_name = sorted[i].field;
             i++;
         }
     }
-- 
1.9.1

--
libvir-list mailing list
libvir-list@xxxxxxxxxx
https://www.redhat.com/mailman/listinfo/libvir-list