Fix one potential OOB read when parsing the config file

1 files changed, 3 insertions, 1 deletions

diff --git a/src/ot_config.c b/src/ot_config.c
index 626ddea..a4c2a47 100644
--- a/src/ot_config.c
+++ b/src/ot_config.c
@@ -79,10 +79,12 @@ static listen_option_kind parse_listen_option(char **p) {
 
   for (i = 0; i < listen_option_count; ++i) {
     const listen_option_key *key = &listen_option_keys[i];
-    char                     delimiter = (*p)[key->len];
+    char                     delimiter;
 
     if (strncmp(*p, key->name, key->len))
       continue;
+    /* The match guarantees *p is at least key->len bytes, so this is in bounds */
+    delimiter = (*p)[key->len];
     if (key->takes_value ? delimiter != '=' : (delimiter && !isspace((unsigned char)delimiter)))
       continue;