commit a77fc2756e9fd0b1bfdbc0259b4fe77fbf1f6d6d
author Ronald Cron <ronald.cron@arm.com> Wed Mar 30 17:20:47 2022 +0200
committer Ronald Cron <ronald.cron@arm.com> Thu Mar 31 09:27:35 2022 +0200
tree 63a5e691ad5d2478af07cd4bccb27a4ae23278af
parent 37bdaab64f7bf5fe5ef319b1a2504d692828ae62

ssl_tls13_client.c: versions ext writing : Fix available space check

Signed-off-by: Ronald Cron <ronald.cron@arm.com>

library/ssl_tls13_client.c

diff --git a/library/ssl_tls13_client.c b/library/ssl_tls13_client.c
index 58aac47..7c1f95e 100644
--- a/library/ssl_tls13_client.c
+++ b/library/ssl_tls13_client.c
@@ -60,10 +60,9 @@
      * - extension_type         (2 bytes)
      * - extension_data_length  (2 bytes)
      * - versions_length        (1 byte )
-     * - versions               (2 to 4 bytes)
+     * - versions               (2 or 4 bytes)
      */
-
-    MBEDTLS_SSL_CHK_BUF_PTR( p, end, 9 );
+    MBEDTLS_SSL_CHK_BUF_PTR( p, end, 5 + versions_len );
 
     MBEDTLS_PUT_UINT16_BE( MBEDTLS_TLS_EXT_SUPPORTED_VERSIONS, p, 0 );
     MBEDTLS_PUT_UINT16_BE( versions_len + 1, p, 2 );