Check static bounds of CID lengths in check_config.h
diff --git a/include/mbedtls/check_config.h b/include/mbedtls/check_config.h
index d8b0786..b8b327c 100644
--- a/include/mbedtls/check_config.h
+++ b/include/mbedtls/check_config.h
@@ -646,6 +646,18 @@
#error "MBEDTLS_SSL_CID defined, but not all prerequisites"
#endif
+#if defined(MBEDTLS_SSL_CID) && \
+ defined(MBEDTLS_SSL_CID_IN_LEN_MAX) && \
+ MBEDTLS_SSL_CID_IN_LEN_MAX > 255
+#error "MBEDTLS_SSL_CID_IN_LEN_MAX too large (max 255)"
+#endif
+
+#if defined(MBEDTLS_SSL_CID) && \
+ defined(MBEDTLS_SSL_CID_OUT_LEN_MAX) && \
+ MBEDTLS_SSL_CID_OUT_LEN_MAX > 255
+#error "MBEDTLS_SSL_CID_OUT_LEN_MAX too large (max 255)"
+#endif
+
#if defined(MBEDTLS_SSL_DTLS_BADMAC_LIMIT) && \
( !defined(MBEDTLS_SSL_TLS_C) || !defined(MBEDTLS_SSL_PROTO_DTLS) )
#error "MBEDTLS_SSL_DTLS_BADMAC_LIMIT defined, but not all prerequisites"