From d08d82cd0b9cd41ee8bf1294674b17596c0a0a94 Mon Sep 17 00:00:00 2001
From: Qingsong Chen <changxian.cqs@antgroup.com>
Date: Thu, 27 Nov 2025 09:48:23 +0000
Subject: [PATCH] Fix ext2 DeviceRangeReader to prevent reading invalid blocks

---
 kernel/src/fs/ext2/inode.rs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/src/fs/ext2/inode.rs b/kernel/src/fs/ext2/inode.rs
index e68a35902..3d306b36f 100644
--- a/kernel/src/fs/ext2/inode.rs
+++ b/kernel/src/fs/ext2/inode.rs
@@ -2026,7 +2026,7 @@ impl<'a> DeviceRangeReader<'a> {
 
         // Updates the range
         self.range.start += device_range.len() as Ext2Bid;
-        if device_range.len() == max_cnt {
+        if device_range.len() == max_cnt && !self.range.is_empty() {
             // Updates the indirect block
             self.update_indirect_block()?;
         }