1 files changed, 10 insertions, 7 deletions

diff --git a/auth-options.c b/auth-options.c
index 27c0eb05e..b05d6d6f3 100644
--- a/auth-options.c
+++ b/auth-options.c
@@ -1,4 +1,4 @@
-/* $OpenBSD: auth-options.c,v 1.83 2018/06/19 02:59:41 djm Exp $ */
+/* $OpenBSD: auth-options.c,v 1.84 2018/10/03 06:38:35 djm Exp $ */
 /*
  * Copyright (c) 2018 Damien Miller <djm@mindrot.org>
  *
@@ -469,13 +469,16 @@ sshauthopt_parse(const char *opts, const char **errstrp)
                                 errstr = "invalid environment string";
                                 goto fail;
                         }
-                        for (cp = opt; cp < tmp; cp++) {
-                                if (!isalnum((u_char)*cp) && *cp != '_') {
-                                        free(opt);
-                                        errstr = "invalid environment string";
-                                        goto fail;
-                                }
+                        if ((cp = strdup(opt)) == NULL)
+                                goto alloc_fail;
+                        cp[tmp - opt] = '\0'; /* truncate at '=' */
+                        if (!valid_env_name(cp)) {
+                                free(cp);
+                                free(opt);
+                                errstr = "invalid environment string";
+                                goto fail;
                         }
+                        free(cp);
                         /* Append it. */
                         oarray = ret->env;
                         if ((ret->env = recallocarray(ret->env, ret->nenv,