Hi Phil,
On Fri, Mar 04, 2022 at 11:37:11AM +0100, Phil Sutter wrote:
> When trying to add a rule which contains an anonymous chain to a
> non-existent chain, string_misspell_update() is called with a NULL
> string because the anonymous chain has no name. Avoid this by making the
> function NULL-pointer tolerant.
>
> c330152b7f777 ("src: support for implicit chain bindings")
>
> Signed-off-by: Phil Sutter <phil@xxxxxx>
> ---
> src/misspell.c | 4 ++--
> 1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/src/misspell.c b/src/misspell.c
> index 6536d7557a445..f213a240005e6 100644
> --- a/src/misspell.c
> +++ b/src/misspell.c
> @@ -80,8 +80,8 @@ int string_misspell_update(const char *a, const char *b,
> {
> unsigned int len_a, len_b, max_len, min_len, distance, threshold;
>
> - len_a = strlen(a);
> - len_b = strlen(b);
> + len_a = a ? strlen(a) : 0;
> + len_b = b ? strlen(b) : 0;
string_distance() assumes non-NULL too.
probably shortcircuit chain_lookup_fuzzy() earlier since h->chain.name
is always NULL, to avoid the useless loop.
Patch attached.
> max_len = max(len_a, len_b);
> min_len = min(len_a, len_b);
> --
> 2.34.1
>
diff --git a/src/rule.c b/src/rule.c
index b1700c40079d..19b8cb0323ee 100644
--- a/src/rule.c
+++ b/src/rule.c
@@ -758,6 +758,9 @@ struct chain *chain_lookup_fuzzy(const struct handle *h,
struct table *table;
struct chain *chain;
+ if (!h->chain.name)
+ return NULL;
+
string_misspell_init(&st);
list_for_each_entry(table, &cache->table_cache.list, cache.list) {
