Add `NULL` check in `sg_compact()`; fix #4139

249fef7d · Yukihiro "Matz" Matsumoto · 82e00ce6 · 249fef7d
Commit 249fef7d authored Oct 12, 2018 by Yukihiro "Matz" Matsumoto
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src/hash.c src/hash.c +3 -1

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--- a/src/hash.c
+++ b/src/hash.c
@@ -226,12 +226,14 @@ sg_index(mrb_state *mrb, seglist *t)
 static void
 sg_compact(mrb_state *mrb, seglist *t)
 {
-  segment *seg = t->rootseg;
+  segment *seg;
  mrb_int i;
  segment *seg2 = NULL;
  mrb_int i2;
  mrb_int size = 0;

+  if (t == NULL) return;
+  seg = t->rootseg;
  if (t->index && (size_t)t->size == t->index->size) {
    sg_index(mrb, t);
    return;