From eeffd5be07a0ece25e8ba799e41bd2b0f29d23f1 Mon Sep 17 00:00:00 2001
From: Andreas Kling <kling@serenityos.org>
Date: Wed, 7 Oct 2020 13:42:17 +0200
Subject: [PATCH] Ext2FS: Fix block allocation ignoring the very last block
 group

The block group indices are 1-based for some reason. Because of that,
we were forgetting to check in the very last block group when doing
block allocation. This caused block allocation to fail even when the
superblock indicated that we had free blocks.

Fixes #3674.
---
 Kernel/FileSystem/Ext2FileSystem.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Kernel/FileSystem/Ext2FileSystem.cpp b/Kernel/FileSystem/Ext2FileSystem.cpp
index a31abaef50..e85b302e02 100644
--- a/Kernel/FileSystem/Ext2FileSystem.cpp
+++ b/Kernel/FileSystem/Ext2FileSystem.cpp
@@ -1135,7 +1135,7 @@ Vector<Ext2FS::BlockIndex> Ext2FS::allocate_blocks(GroupIndex preferred_group_in
         } else {
             if (group_index == preferred_group_index)
                 group_index = 1;
-            for (; group_index < m_block_group_count; ++group_index) {
+            for (; group_index <= m_block_group_count; ++group_index) {
                 if (group_descriptor(group_index).bg_free_blocks_count) {
                     found_a_group = true;
                     break;