libxc: fix uninitialized variable when changing rtds scheduling parameters

Commit 046c2b503a89d21b41e4d555a9f75d02af00dbc6 introduces a build
failure: in some cases (e.g., num_vcpus <=0),
xc_sched_rtds_vcpu_get/set returns an uninitialized variable.

Fix it.

Reported-by: Andrew Cooper <andrew.cooper3@citrix.com>
Signed-off-by: Chong Li <chong.li@wustl.edu>
Reviewed-by: Andrew Cooper <andrew.cooper3@citrix.com>

diff --git a/tools/libxc/xc_rt.c b/tools/libxc/xc_rt.c
index 221d17fa7cd6d42e0b93a43b8b53c507d38ffa23..77aaa36ae16c98b85a742090a8509c8b71fd938d 100644 (file)
--- a/tools/libxc/xc_rt.c
+++ b/tools/libxc/xc_rt.c
@@ -68,7 +68,7 @@ int xc_sched_rtds_vcpu_set(xc_interface *xch,
                            struct xen_domctl_schedparam_vcpu *vcpus,
                            uint32_t num_vcpus)
 {
-    int rc;
+    int rc = 0;
     unsigned processed = 0;
     DECLARE_DOMCTL;
     DECLARE_HYPERCALL_BOUNCE(vcpus, sizeof(*vcpus) * num_vcpus,
@@ -102,7 +102,7 @@ int xc_sched_rtds_vcpu_get(xc_interface *xch,
                            struct xen_domctl_schedparam_vcpu *vcpus,
                            uint32_t num_vcpus)
 {
-    int rc;
+    int rc = 0;
     unsigned processed = 0;
     DECLARE_DOMCTL;
     DECLARE_HYPERCALL_BOUNCE(vcpus, sizeof(*vcpus) * num_vcpus,