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gotwebd: error path leak & semplification for render_index
On Tue, Nov 22, 2022 at 12:04:44PM +0100, Omar Polo wrote:
> On 2022/11/09 18:36:27 +0100, Omar Polo <op@omarpolo.com> wrote:
> > On 2022/11/09 15:48:47 +0100, Stefan Sperling <stsp@stsp.name> wrote:
> > > On Wed, Nov 09, 2022 at 03:27:52PM +0100, Omar Polo wrote:
> > > > - strcmp(sd_dent[d_i]->d_name, "..") == 0)
> > > > + strcmp(sd_dent[d_i]->d_name, "..") == 0 ||
> > > > + sd_dent[d_i]->d_type != DT_DIR) {
> > >
> > > Unfortunately, we cannot rely on d_type directly. It is unreliable
> > > because it depends on the filesystem implementation.
> > > See got_path_dirent_type() in lib/path.c for a workaround.
> >
> > Indeed, i forgot about the NFS without readdir plus issue. Here's an
> > updated diff that uses got_path_dirent_type.
>
> ping
ok by me.
> -----------------------------------------------
> commit ee2f63eba45d621e2387fe7297d27dec9290a4e8
> from: Omar Polo <op@omarpolo.com>
> date: Tue Nov 22 11:00:49 2022 UTC
>
> gotwebd: simplify gotweb_render_index
>
> - drops the double loop; paginate in one go
>
> - avoid lstat + got_path_dir_is_empty for each entry: use dt_type if
> provided by the underlying filesystem
>
> - fixes a memleak: before `continue' we need to call
> gotweb_free_repo_dir
>
> diff 0ceb1b9e49ae865b84f237977d7edbcaa9697161 ee2f63eba45d621e2387fe7297d27dec9290a4e8
> commit - 0ceb1b9e49ae865b84f237977d7edbcaa9697161
> commit + ee2f63eba45d621e2387fe7297d27dec9290a4e8
> blob - fdc41cd4d2cb16ff84e4c42c6a8c826e6f239dc0
> blob + 09d8f166fab40a704104d07aaa4c8e0564295c66
> --- gotwebd/gotweb.c
> +++ gotwebd/gotweb.c
> @@ -993,10 +993,9 @@ gotweb_render_index(struct request *c)
> struct repo_dir *repo_dir = NULL;
> DIR *d;
> struct dirent **sd_dent = NULL;
> - char *c_path = NULL;
> - struct stat st;
> unsigned int d_cnt, d_i, d_disp = 0;
> - int r;
> + unsigned int d_skipped = 0;
> + int r, type;
>
> d = opendir(srv->repos_path);
> if (d == NULL) {
> @@ -1011,25 +1010,6 @@ gotweb_render_index(struct request *c)
> goto done;
> }
>
> - /* get total count of repos */
> - for (d_i = 0; d_i < d_cnt; d_i++) {
> - if (strcmp(sd_dent[d_i]->d_name, ".") == 0 ||
> - strcmp(sd_dent[d_i]->d_name, "..") == 0)
> - continue;
> -
> - if (asprintf(&c_path, "%s/%s", srv->repos_path,
> - sd_dent[d_i]->d_name) == -1) {
> - error = got_error_from_errno("asprintf");
> - goto done;
> - }
> -
> - if (lstat(c_path, &st) == 0 && S_ISDIR(st.st_mode) &&
> - !got_path_dir_is_empty(c_path))
> - t->repos_total++;
> - free(c_path);
> - c_path = NULL;
> - }
> -
> r = fcgi_printf(c, "<div id='index_header'>\n"
> "<div id='index_header_project'>Project</div>\n");
> if (r == -1)
> @@ -1055,9 +1035,20 @@ gotweb_render_index(struct request *c)
> break;
>
> if (strcmp(sd_dent[d_i]->d_name, ".") == 0 ||
> - strcmp(sd_dent[d_i]->d_name, "..") == 0)
> + strcmp(sd_dent[d_i]->d_name, "..") == 0) {
> + d_skipped++;
> continue;
> + }
>
> + error = got_path_dirent_type(&type, srv->repos_path,
> + sd_dent[d_i]);
> + if (error)
> + goto done;
> + if (type != DT_DIR) {
> + d_skipped++;
> + continue;
> + }
> +
> if (qs->index_page > 0 && (qs->index_page *
> srv->max_repos_display) > t->prev_disp) {
> t->prev_disp++;
> @@ -1071,21 +1062,14 @@ gotweb_render_index(struct request *c)
> error = gotweb_load_got_path(c, repo_dir);
> if (error && error->code == GOT_ERR_NOT_GIT_REPO) {
> error = NULL;
> - continue;
> - }
> - else 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 {
> gotweb_free_repo_dir(repo_dir);
> repo_dir = NULL;
> + d_skipped++;
> continue;
> }
> -render:
> + if (error && error->code != GOT_ERR_LONELY_PACKIDX)
> + goto done;
> +
> d_disp++;
> t->prev_disp++;
>
> @@ -1201,6 +1185,8 @@ render:
> if (d_disp == srv->max_repos_display)
> break;
> }
> + t->repos_total = d_cnt - d_skipped;
> +
> if (srv->max_repos_display == 0)
> goto done;
> if (srv->max_repos > 0 && srv->max_repos < srv->max_repos_display)
>
>
gotwebd: error path leak & semplification for render_index