BUG/MEDIUM: cli: fix "help" crashing since recent spelling fixes

I somehow managed to re-break the "help" command in b736458bf ("MEDIUM:
cli: apply spelling fixes for known commands before listing them")
after fixing it once. A null-deref happens when checking the args
early in the processing.

No backport is needed as this was introduced in 2.4-dev12.

diff --git a/src/cli.c b/src/cli.c
index 5ea040e..cfe14d6 100644 (file)
--- a/src/cli.c
+++ b/src/cli.c
@@ -140,7 +140,7 @@ static char *cli_gen_usage_msg(struct appctx *appctx, char * const *args)
        /* In case of partial match we'll look for the best matching entries
         * starting from position <length>
         */
-       if (args[length] && *args[length]) {
+       if (args && args[length] && *args[length]) {
                list_for_each_entry(kw_list, &cli_keywords.list, list) {
                        for (kw = &kw_list->kw[0]; kw->str_kw[0]; kw++) {
                                if (kw->level & ~appctx->cli_level & (ACCESS_MASTER_ONLY|ACCESS_EXPERT))