Task #9522: Fix possibility of overlapping allocation in SparseSetAllocator

RTCP/Cobalt/CoInterface/src/Allocator.cc

@@ -124,6 +124,11 @@ namespace LOFAR
       for (SparseSet<void *>::const_iterator it = freeList.getRanges().begin(); it != freeList.getRanges().end(); it++) {
         void *begin = align(it->begin, alignment);
 
+        if ((char *) begin >= (char *) it->end ) {
+          // alignment shift already results in out of bounds
+          continue;
+        }
+
         if ((char *) it->end - (char *) begin >= (ptrdiff_t) size) {
           // enough space -- reserve it
           freeList.exclude(begin, (void *) ((char *) begin + size));