From 7b6e3dfbb05f4dea30d6d91f1f6345b3d66ed9b7 Mon Sep 17 00:00:00 2001
From: cui <cuiweixie@gmail.com>
Date: Tue, 24 Mar 2026 00:28:51 +0800
Subject: [PATCH] Fix ReadlinkSlow buffer when lstat reports zero size (#6948)

When the symlink target length from lstat was 0, the code resized the
buffer using status.size() instead of buffer_size, so the first
allocation stayed empty instead of using MinBufferSize. Align the resize
with the buffer_size path used for readlinkat.
---
 common/filesystem.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/common/filesystem.cpp b/common/filesystem.cpp
index dce5d7b75fc6..904beb2c5db0 100644
--- a/common/filesystem.cpp
+++ b/common/filesystem.cpp
@@ -643,7 +643,7 @@ auto DirRef::ReadlinkSlow(const std::filesystem::path& path)
   if (buffer_size == 0) {
     buffer_size = MinBufferSize;
   }
-  large_buffer.resize(status.size());
+  large_buffer.resize(buffer_size);
   ssize_t result =
       readlinkat(dfd_, path.c_str(), large_buffer.data(), large_buffer.size());
   if (result == -1) {