process.c: argument types over conversion

* process.c (rb_exec_getargs): honor the expected argument types
  over the conversion method.  the basic language functionality
  should be robust.  [ruby-core:75388] [Bug #12355]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@54934 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 14 insertions, 2 deletions

diff --git a/process.c b/process.c
index 6f3fc235f2..75f51c8a76 100644
--- a/process.c
+++ b/process.c
@@ -1986,12 +1986,24 @@ rb_check_argv(int argc, VALUE *argv)
 }
 
 static VALUE
+check_hash(VALUE obj)
+{
+    if (RB_SPECIAL_CONST_P(obj)) return Qnil;
+    switch (RB_BUILTIN_TYPE(obj)) {
+      case T_STRING:
+      case T_ARRAY:
+	return Qnil;
+    }
+    return rb_check_hash_type(obj);
+}
+
+static VALUE
 rb_exec_getargs(int *argc_p, VALUE **argv_p, int accept_shell, VALUE *env_ret, VALUE *opthash_ret)
 {
     VALUE hash, prog;
 
     if (0 < *argc_p) {
-        hash = rb_check_hash_type((*argv_p)[*argc_p-1]);
+        hash = check_hash((*argv_p)[*argc_p-1]);
         if (!NIL_P(hash)) {
             *opthash_ret = hash;
             (*argc_p)--;
@@ -1999,7 +2011,7 @@ rb_exec_getargs(int *argc_p, VALUE **argv_p, int accept_shell, VALUE *env_ret, V
     }
 
     if (0 < *argc_p) {
-        hash = rb_check_hash_type((*argv_p)[0]);
+        hash = check_hash((*argv_p)[0]);
         if (!NIL_P(hash)) {
             *env_ret = hash;
             (*argc_p)--;