[RFC PATCH 4/4] cert:xen/xsm/flask: Add missing default labels to switch statements

[Oleksandr Andrushchenko <andr2000@gmail.com>]

From: Oleksandr Andrushchenko <oleksandr_andrushchenko@epam.com>

It is required by MISRA [1] that every switch statement has a default
label as a measure of defensive programming technique.

The changes in this patch are to match MISRA C:2012: Rule 16.4
requirements.

[1] https://www.misra.org.uk/

Signed-off-by: Oleksandr Andrushchenko <oleksandr_andrushchenko@epam.com>
---
 xen/xsm/flask/avc.c         | 2 ++
 xen/xsm/flask/hooks.c       | 4 ++++
 xen/xsm/flask/ss/services.c | 5 +++++
 3 files changed, 11 insertions(+)

diff --git a/xen/xsm/flask/avc.c b/xen/xsm/flask/avc.c
index 640c708659b0..06ac404b0ad6 100644
--- a/xen/xsm/flask/avc.c
+++ b/xen/xsm/flask/avc.c
@@ -590,6 +590,8 @@ void avc_audit(u32 ssid, u32 tsid, u16 tclass, u32 requested,
     case AVC_AUDIT_DATA_DTDEV:
         avc_printk(&buf, "dtdevice=%s ", a->dtdev);
         break;
+    default:
+        break;
     }
 
     avc_dump_query(&buf, ssid, tsid, tclass);
diff --git a/xen/xsm/flask/hooks.c b/xen/xsm/flask/hooks.c
index 3d00c747f6b7..f29c4a4ffd05 100644
--- a/xen/xsm/flask/hooks.c
+++ b/xen/xsm/flask/hooks.c
@@ -339,6 +339,8 @@ static char *flask_show_security_evtchn(struct domain *d, const struct evtchn *c
         if (irq && get_irq_sid(irq, &sid, NULL))
             return NULL;
         break;
+    default:
+        break;
     }
     if ( !sid )
         return NULL;
@@ -1246,6 +1248,8 @@ static int flask_hvm_altp2mhvm_op(struct domain *d, uint64_t mode, uint32_t op)
         if ( d == current->domain )
             return -EPERM;
         break;
+    default:
+        return -EPERM;
     };
 
     return current_has_perm(d, SECCLASS_HVM, HVM__ALTP2MHVM_OP);
diff --git a/xen/xsm/flask/ss/services.c b/xen/xsm/flask/ss/services.c
index b59928ea8a98..30dab4c35308 100644
--- a/xen/xsm/flask/ss/services.c
+++ b/xen/xsm/flask/ss/services.c
@@ -1018,6 +1018,11 @@ static int security_compute_sid(u32 ssid,
             /* Use the related object owner. */
             newcontext.user = tcontext->user;
         break;
+        default:
+            printk(KERN_ERR "security_compute_sid:  unrecognized AVTAB %d\n",
+                   specified);
+            rc = -EINVAL;
+            goto out_unlock;
     }
 
     /* Set the role and type to default values. */
-- 
2.20.1


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