[PRISM] Fix crash in compile_prism

If the argument is not a file or a string, it assumes it's a string
which will crash because RSTRING_PTR and RSTRING_LEN assumes it's a
string.

1 files changed, 1 insertions, 0 deletions

diff --git a/iseq.c b/iseq.c
index 28c2d4f80b..4f1c39d2ae 100644
--- a/iseq.c
+++ b/iseq.c
@@ -1485,6 +1485,7 @@ iseqw_s_compile_prism(int argc, VALUE *argv, VALUE self)
         pm_string_mapped_init(&input, RSTRING_PTR(file));
     }
     else {
+        Check_Type(src, T_STRING);
         input.source = (const uint8_t *)RSTRING_PTR(src);
         input.length = RSTRING_LEN(src);
         input.type = PM_STRING_SHARED;