From: Omar Polo <op@omarpolo.com>
Subject: gotwebd: error path leak & semplification for render_index
To: gameoftrees@openbsd.org
Date: Sat, 05 Nov 2022 12:42:27 +0100

I'm still trying to migrate gotwebd to that templating system I posted
some time ago and so I'm re-reading all the code that produces the
html...

There's a memory leak in the error path if asprintf fails, and while
here I'd also like to simplify the check and remove the `goto render'.

diff /home/op/w/gotd
commit - 36c7cfbb2a9b646bfb1658fca4e34bc63a46ec42
path + /home/op/w/gotd
blob - 89220d16dadb171f6bf179e5fa2d7118b94a4aad
file + gotwebd/gotweb.c
--- gotwebd/gotweb.c
+++ gotwebd/gotweb.c
@@ -1020,7 +1020,7 @@ gotweb_render_index(struct request *c)
 		if (asprintf(&c_path, "%s/%s", srv->repos_path,
 		    sd_dent[d_i]->d_name) == -1) {
 			error = got_error_from_errno("asprintf");
-			return error;
+			goto done;
 		}
 
 		if (lstat(c_path, &st) == 0 && S_ISDIR(st.st_mode) &&
@@ -1073,19 +1073,17 @@ gotweb_render_index(struct request *c)
 			error = NULL;
 			continue;
 		}
-		else if (error && error->code != GOT_ERR_LONELY_PACKIDX)
+		if (error && error->code != GOT_ERR_LONELY_PACKIDX)
 			goto done;
 
-		if (lstat(repo_dir->path, &st) == 0 &&
-		    S_ISDIR(st.st_mode) &&
-		    !got_path_dir_is_empty(repo_dir->path))
-			goto render;
-		else {
+		if (lstat(repo_dir->path, &st) == -1 ||
+		    !S_ISDIR(st.st_mode) ||
+		    got_path_dir_is_empty(repo_dir->path)) {
 			gotweb_free_repo_dir(repo_dir);
 			repo_dir = NULL;
 			continue;
 		}
-render:
+
 		d_disp++;
 		t->prev_disp++;