src and dst may be the same

diff --git a/src/lib/io/ring_buffer.c b/src/lib/io/ring_buffer.c
index 8e8648e6104ea194cc59b501b9cfa40d83e29e12..ab6c7426be079ec1954a32066848c02cd9d187d5 100644 (file)
--- a/src/lib/io/ring_buffer.c
+++ b/src/lib/io/ring_buffer.c
@@ -344,6 +344,14 @@ uint8_t *fr_ring_buffer_reserve_split(fr_ring_buffer_t *dst, size_t reserve_size
        p = fr_ring_buffer_reserve(dst, reserve_size);
        if (!p) return NULL;
 
+       /*
+        *      Alloc and reserve in the same ring buffer.  Maybe
+        *      there's no need to memcpy() the data?
+        */
+       if ((src == dst) && (p == (src->buffer + src->write_offset))) {
+               return 0;
+       }
+
        /*
         *      Copy the data from the old buffer to the new one.
         */