memory: add a check to avoid overflow

No caller ran into this, but good to make sure.

Author: benma

src/memory/memory.c

@@ -502,6 +502,9 @@ bool memory_set_encrypted_seed_and_hmac(const uint8_t* encrypted_seed_and_hmac,
 {
     chunk_1_t chunk = {0};
     CLEANUP_CHUNK(chunk);
+    if (len > sizeof(chunk.fields.encrypted_seed_and_hmac)) {
+        return false;
+    }
     _read_chunk(CHUNK_1, chunk_bytes);
     chunk.fields.encrypted_seed_and_hmac_len = len;
     memset(