From: Karsten Blees <blees@dcon.de>
Date: Tue, 16 Dec 2025 15:33:48 +0000 (+0000)
Subject: strbuf_readlink(): support link targets that exceed PATH_MAX
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=5f09f93726e71552a0f5ffd72d488ed8dbbedee9;p=thirdparty%2Fgit.git

strbuf_readlink(): support link targets that exceed PATH_MAX

The `strbuf_readlink()` function refuses to read link targets that
exceed PATH_MAX (even if a sufficient size was specified by the caller).

As some platforms (*cough* Windows *cough*) support longer paths, remove
this restriction (similar to `strbuf_getcwd()`).

Signed-off-by: Karsten Blees <blees@dcon.de>
Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
---

diff --git a/strbuf.c b/strbuf.c
index 44a8f6a554..fa4e30f112 100644
--- a/strbuf.c
+++ b/strbuf.c
@@ -566,8 +566,6 @@ ssize_t strbuf_write(struct strbuf *sb, FILE *f)
 	return sb->len ? fwrite(sb->buf, 1, sb->len, f) : 0;
 }
 
-#define STRBUF_MAXLINK (2*PATH_MAX)
-
 int strbuf_readlink(struct strbuf *sb, const char *path, size_t hint)
 {
 	size_t oldalloc = sb->alloc;
@@ -575,7 +573,7 @@ int strbuf_readlink(struct strbuf *sb, const char *path, size_t hint)
 	if (hint < 32)
 		hint = 32;
 
-	while (hint < STRBUF_MAXLINK) {
+	for (;;) {
 		ssize_t len;
 
 		strbuf_grow(sb, hint + 1);