diff options
Diffstat (limited to 'io_buffer.c')
| -rw-r--r-- | io_buffer.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/io_buffer.c b/io_buffer.c index c276838a3b..87b51c0b8c 100644 --- a/io_buffer.c +++ b/io_buffer.c @@ -1340,7 +1340,8 @@ rb_io_buffer_get_bytes(VALUE self, void **base, size_t *size) static inline void io_buffer_get_bytes_for_writing(struct rb_io_buffer *buffer, void **base, size_t *size) { - if (buffer->flags & RB_IO_BUFFER_READONLY) { + if (buffer->flags & RB_IO_BUFFER_READONLY || + (!NIL_P(buffer->source) && OBJ_FROZEN(buffer->source))) { rb_raise(rb_eIOBufferAccessError, "Buffer is not writable!"); } |