admin/git
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

promisor-remote: fix segfault when remote URL is missing

Browse Source 
Using strvec_push() to push `NULL` into a 'strvec' results in a
segfault, because `xstrdup(NULL)` crashes.

So when an URL is missing from the config, let's not push the remote
name and URL into the 'strvec's.

While at it, let's also not push them in case the URL is empty. It's
just not worth the trouble and it's consistent with how Git otherwise
treats missing and empty URLs in the same way.

Note that in case of missing or empty URL, Git uses the remote name to
fetch, which can work if the remote is on the same filesystem. So
configurations where the client, server and remote are all on the same
filesystem may need URLs to be configured even if they are the same as
the remote names. But this is a rare case, and the work around is easy
enough.

We leave improving the strvec API and/or xstrdup() for a future
separate effort.

While at it, let's also use git_config_get_string_tmp() instead of
git_config_get_string() to simplify memory management.

Helped-by: Jeff King <peff@peff.net>
Signed-off-by: Christian Couder <chriscool@tuxfamily.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Christian Couder
2025-03-18 12:00:06 +01:00
committed by Junio C Hamano
parent 9e05fbe61b
commit b059339bb3
2 changed files with 69 additions and 8 deletions
Download Patch File Download Diff File Expand all files Collapse all files

16
promisor-remote.c
View File

@@ -323,13 +323,15 @@ static void promisor_info_vecs(struct repository *repo,
promisor_remote_init(repo);
for (r = repo->promisor_remote_config->promisors; r; r = r->next) {
char *url;
const char *url;
char *url_key = xstrfmt("remote.%s.url", r->name);
strvec_push(names, r->name);
strvec_push(urls, git_config_get_string(url_key, &url) ? NULL : url);
/* Only add remotes with a non empty URL */
if (!git_config_get_string_tmp(url_key, &url) && *url) {
strvec_push(names, r->name);
strvec_push(urls, url);
}
free(url);
free(url_key);
}
}
@@ -356,10 +358,8 @@ char *promisor_remote_info(struct repository *repo)
strbuf_addch(&sb, ';');
strbuf_addstr(&sb, "name=");
strbuf_addstr_urlencode(&sb, names.v[i], allow_unsanitized);
if (urls.v[i]) {
strbuf_addstr(&sb, ",url=");
strbuf_addstr_urlencode(&sb, urls.v[i], allow_unsanitized);
}
strbuf_addstr(&sb, ",url=");
strbuf_addstr_urlencode(&sb, urls.v[i], allow_unsanitized);
}
strvec_clear(&names);