fix potential memory leaks

* gc.c (rb_alloc_tmp_buffer_with_count): keep the order; allocate
  an empty imemo first then xmalloc, to get rid of potential
  memory leak when allocation imemo failed.

* parse.y (rb_parser_malloc, rb_parser_calloc, rb_parser_realloc):
  ditto.

* process.c (rb_execarg_allocate_dup2_tmpbuf): ditto.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@63385 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 3 insertions, 5 deletions

diff --git a/process.c b/process.c
index 5601d82cdc..c1c8432a45 100644
--- a/process.c
+++ b/process.c
@@ -2358,11 +2358,9 @@ open_func(void *ptr)
 static void
 rb_execarg_allocate_dup2_tmpbuf(struct rb_execarg *eargp, long len)
 {
-    eargp->dup2_tmpbuf =
-        rb_imemo_tmpbuf_auto_free_pointer(
-            ruby_xmalloc(
-                run_exec_dup2_tmpbuf_size(
-                    len)));
+    VALUE tmpbuf = rb_imemo_tmpbuf_auto_free_pointer(NULL);
+    ((rb_imemo_tmpbuf_t *)tmpbuf)->ptr = ruby_xmalloc(run_exec_dup2_tmpbuf_size(len));
+    eargp->dup2_tmpbuf = tmpbuf;
 }
 
 static VALUE