Re: [PATCH] fmt-merge-msg: plug small leak of commit buffer

> I note that record_person does not seem to care about the commit at all,
> so an alternative fix would be:
>
> diff --git a/builtin/fmt-merge-msg.c b/builtin/fmt-merge-msg.c
> index 1d962dc..9f0e608 100644
> --- a/builtin/fmt-merge-msg.c
> +++ b/builtin/fmt-merge-msg.c
> @@ -223,16 +223,14 @@ static void add_branch_desc(struct strbuf *out, const char *name)
>  
>  #define util_as_integral(elem) ((intptr_t)((elem)->util))
>  
> -static void record_person(int which, struct string_list *people,
> -			  struct commit *commit)
> +static void record_person_from_buf(int which, struct string_list *people,
> +				   const char *buffer)
>  {
> -	const char *buffer;
>  	char *name_buf, *name, *name_end;
>  	struct string_list_item *elem;
>  	const char *field;
>  
>  	field = (which == 'a') ? "\nauthor " : "\ncommitter ";
> -	buffer = get_commit_buffer(commit, NULL);
>  	name = strstr(buffer, field);
>  	if (!name)
>  		return;
> @@ -245,7 +243,6 @@ static void record_person(int which, struct string_list *people,
>  	if (name_end < name)
>  		return;
>  	name_buf = xmemdupz(name, name_end - name + 1);
> -	unuse_commit_buffer(commit, buffer);
>  
>  	elem = string_list_lookup(people, name_buf);
>  	if (!elem) {
> @@ -256,6 +253,14 @@ static void record_person(int which, struct string_list *people,
>  	free(name_buf);
>  }
>  
> +static void record_person(int which, struct string_list *people,
> +			  struct commit *commit)
> +{
> +	const char *buf = get_commit_buffer(commit, NULL);
> +	record_person_from_buf(which, people, buf);
> +	unuse_commit_buffer(commit, buf);
> +}
> +
>  static int cmp_string_list_util_as_integral(const void *a_, const void *b_)
>  {
>  	const struct string_list_item *a = a_, *b = b_;
>
>
> This has the slight advantage that it adapts naturally if record_person
> grows more exits, but I don't think it is a big deal either way (it only
> matters if the new exit fails to copy the surrounding code and use "goto
> leave").