live: add disk index bounds check

Add disk index bounds checks for setup() and image_create().
Prevent backtrace logging when an invalid disk index is used.

src/live/ogOperations.py

@@ -413,7 +413,7 @@ class OgLiveOperations:
 
     def setup(self, request, ogRest):
         table_type = request.getType()
-        disk = request.getDisk()
+        disk = int(request.getDisk())
         cache = request.getCache()
         cache_size = request.getCacheSize()
         partlist = request.getPartitionSetup()
@@ -424,7 +424,10 @@ class OgLiveOperations:
         umount_all()
         umount_cache()
 
-        diskname = get_disks()[int(disk)-1]
+        if disk < 0 or disk > len(get_disks()):
+            raise OgError(f'Invalid disk number {disk}, {len(get_disks())} disks available.')
+
+        diskname = get_disks()[disk-1]
         cxt = fdisk.Context(f'/dev/{diskname}',
                             details=True)
 
@@ -469,9 +472,9 @@ class OgLiveOperations:
 
             partition = int(part["partition"])
             if fs == 'cache':
-                err = mkfs('ext4', int(disk), partition, label='CACHE')
+                err = mkfs('ext4', disk, partition, label='CACHE')
             else:
-                err = mkfs(fs, int(disk), partition)
+                err = mkfs(fs, disk, partition)
 
             if err == -1:
                 raise OgError(f'Failed to format {part["partition"]} with filesystem {part["filesystem"]}')
@@ -554,6 +557,9 @@ class OgLiveOperations:
         if ogRest.terminated:
             return
 
+        if disk < 0 or disk > len(get_disks()):
+            raise OgError(f'Invalid disk number {disk}, {len(get_disks())} disks available.')
+
         diskname = get_disks()[disk-1]
         cxt = fdisk.Context(f'/dev/{diskname}', details=True)
         pa = None