ext4: implement filesystem specific alloc_inode in unit test

We expect inode with ext4_info_info type as following:
mbt_kunit_init
  mbt_mb_init
    ext4_mb_init
      ext4_mb_init_backend
        sbi->s_buddy_cache = new_inode(sb);
        EXT4_I(sbi->s_buddy_cache)->i_disksize = 0;

Implement alloc_inode ionde with ext4_inode_info type to avoid
out-of-bounds write.

Signed-off-by: Kemeng Shi <shikemeng@huaweicloud.com>
Reported-by: Guenter Roeck <linux@roeck-us.net>
Tested-by: Guenter Roeck <linux@roeck-us.net>
Link: https://lore.kernel.org/r/20240322165518.8147-1-shikemeng@huaweicloud.com
Signed-off-by: Theodore Ts'o <tytso@mit.edu>

diff --git a/fs/ext4/mballoc-test.c b/fs/ext4/mballoc-test.c
index 044ca5238f41915a709ac3c9d391cf8bd4b7447e..49aabcfe6b46d478606047f0b3109898ce7b1e1d 100644 (file)
--- a/fs/ext4/mballoc-test.c
+++ b/fs/ext4/mballoc-test.c
@@ -30,7 +30,31 @@ struct mbt_ext4_super_block {
 #define MBT_CTX(_sb) (&MBT_SB(_sb)->mbt_ctx)
 #define MBT_GRP_CTX(_sb, _group) (&MBT_CTX(_sb)->grp_ctx[_group])
 
+static struct inode *mbt_alloc_inode(struct super_block *sb)
+{
+       struct ext4_inode_info *ei;
+
+       ei = kmalloc(sizeof(struct ext4_inode_info), GFP_KERNEL);
+       if (!ei)
+               return NULL;
+
+       INIT_LIST_HEAD(&ei->i_orphan);
+       init_rwsem(&ei->xattr_sem);
+       init_rwsem(&ei->i_data_sem);
+       inode_init_once(&ei->vfs_inode);
+       ext4_fc_init_inode(&ei->vfs_inode);
+
+       return &ei->vfs_inode;
+}
+
+static void mbt_free_inode(struct inode *inode)
+{
+       kfree(EXT4_I(inode));
+}
+
 static const struct super_operations mbt_sops = {
+       .alloc_inode    = mbt_alloc_inode,
+       .free_inode     = mbt_free_inode,
 };
 
 static void mbt_kill_sb(struct super_block *sb)