commit f518f81d41bb44ae548f0321a260e1e761f47bea
author Paul Elliott <paul.elliott@arm.com> Mon Jul 11 12:36:20 2022 +0100
committer Paul Elliott <paul.elliott@arm.com> Mon Jul 11 12:37:47 2022 +0100
tree 170a2f6d7da901c5166386404eadc2fc62c8391e
parent 9a8d78419f492a5c0db2a13cdd196a7a33785f20

Ensure return for mbedtls_ssl_write_alpn_ext() is checked

Signed-off-by: Paul Elliott <paul.elliott@arm.com>

library/ssl_tls12_server.c

diff --git a/library/ssl_tls12_server.c b/library/ssl_tls12_server.c
index bfe3e8e..4e18e62 100644
--- a/library/ssl_tls12_server.c
+++ b/library/ssl_tls12_server.c
@@ -2387,7 +2387,10 @@
 
 #if defined(MBEDTLS_SSL_ALPN)
     unsigned char *end = buf + MBEDTLS_SSL_OUT_CONTENT_LEN - 4;
-    mbedtls_ssl_write_alpn_ext( ssl, p + 2 + ext_len, end, &olen );
+    if( ( ret = mbedtls_ssl_write_alpn_ext( ssl, p + 2 + ext_len, end, &olen ) )
+        != 0 )
+        return ret;
+
     ext_len += olen;
 #endif