add comment about monitor flags bug

diff --git a/interface.c b/interface.c
index d83a0231d9c26ba9c4db52093cbae48b3a61ac22..e8f3ea1bb142e517cb203370f55450bb494e0f56 100644 (file)
--- a/interface.c
+++ b/interface.c
@@ -39,6 +39,13 @@ static int parse_mntr_flags(int *_argc, char ***_argv,
                     flag < NL80211_MNTR_FLAG_MAX; flag++) {
                        if (strcmp(*argv, mntr_flags[flag]) == 0) {
                                ok = 1;
+                               /*
+                                * This shouldn't be adding "flag" if that is
+                                * zero, but due to a problem in the kernel's
+                                * nl80211 code (using NLA_NESTED policy) it
+                                * will reject an empty nested attribute but
+                                * not one that contains an invalid attribute
+                                */
                                NLA_PUT_FLAG(flags, flag);
                                break;
                        }