Add sanity check to ssl_get_prev_session

[openssl.git] / ssl / ssl_sess.c

diff --git a/ssl/ssl_sess.c b/ssl/ssl_sess.c
index 4c7f5d8b4e32d3e09690e8f313d62ddd08cbc95b..eb7936b4e1d390d86d0e23e854dfc987aee51cb6 100644 (file)
--- a/ssl/ssl_sess.c
+++ b/ssl/ssl_sess.c
@@ -478,7 +478,7 @@ int ssl_get_prev_session(SSL *s, unsigned char *session_id, int len,
     int r;
 #endif
 
-    if (len > SSL_MAX_SSL_SESSION_ID_LENGTH)
+    if (len < 0 || len > SSL_MAX_SSL_SESSION_ID_LENGTH)
         goto err;
 
     if (session_id + len > limit) {