linux-kernel - Re: [PATCH v2 2/2] hfsplus: fix uninit-value in hfsplus_delete

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Date:   Sat, 17 Dec 2022 10:20:39 +0800
From:   ChenXiaoSong <chenxiaosong2@...wei.com>
To:     Viacheslav Dubeyko <slava@...eyko.com>
CC:     Bart Van Assche <bvanassche@....org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Aditya Garg <gargaditya08@...e.com>,
        Jens Axboe <axboe@...nel.dk>,
        "Matthew Wilcox (Oracle)" <willy@...radead.org>,
        Damien Le Moal <damien.lemoal@...nsource.wdc.com>,
        Jeff Layton <jlayton@...nel.org>, <hannes@...xchg.org>,
        "Theodore Y . Ts'o" <tytso@....edu>, <muchun.song@...ux.dev>,
        Linux FS Devel <linux-fsdevel@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 2/2] hfsplus: fix uninit-value in hfsplus_delete_cat()

在 2022/12/17 2:09, Viacheslav Dubeyko 写道>
> So, where is here hip->subfolders = 0; /* I am here */? Sorry, maybe I missed some email.
> 

1/2 patch do not show more detail about 'hip->subfolders ', you can 
apply the patchset to baseline and use '--unified' option to 'git show' 
more detail:

```shell
git am '1/2 of the patchset' # to baseline
git show 'commit of 1/2 patch' --unified=16 # specify 16 lines of 
context instead of the default 3 lines
```

then you can see more detail as follows:

```shell
...
-struct inode *hfsplus_new_inode(struct super_block *sb, struct inode *dir,
-                               umode_t mode)
+void hfsplus_init_inode(struct hfsplus_inode_info *hip)
  {
-       struct hfsplus_sb_info *sbi = HFSPLUS_SB(sb);
-       struct inode *inode = new_inode(sb);
-       struct hfsplus_inode_info *hip;
-
-       if (!inode)
-               return NULL;
-
-       inode->i_ino = sbi->next_cnid++;
-       inode_init_owner(&init_user_ns, inode, dir, mode);
-       set_nlink(inode, 1);
-       inode->i_mtime = inode->i_atime = inode->i_ctime = 
current_time(inode);
-
-       hip = HFSPLUS_I(inode);
         INIT_LIST_HEAD(&hip->open_dir_list);
         spin_lock_init(&hip->open_dir_lock);
         mutex_init(&hip->extents_lock);
         atomic_set(&hip->opencnt, 0);
         hip->extent_state = 0;
         hip->flags = 0;
         hip->userflags = 0;
         hip->subfolders = 0; /********* I am here *****************/
         memset(hip->first_extents, 0, sizeof(hfsplus_extent_rec));
         memset(hip->cached_extents, 0, sizeof(hfsplus_extent_rec));
         hip->alloc_blocks = 0;
         hip->first_blocks = 0;
         hip->cached_start = 0;
         hip->cached_blocks = 0;
         hip->phys_size = 0;
         hip->fs_blocks = 0;
         hip->rsrc_inode = NULL;
+}
+
+struct inode *hfsplus_new_inode(struct super_block *sb, struct inode *dir,
+                               umode_t mode)
+{
+       struct hfsplus_sb_info *sbi = HFSPLUS_SB(sb);
+       struct inode *inode = new_inode(sb);
+       struct hfsplus_inode_info *hip;
+
+       if (!inode)
+               return NULL;
+
+       inode->i_ino = sbi->next_cnid++;
+       inode_init_owner(&init_user_ns, inode, dir, mode);
+       set_nlink(inode, 1);
+       inode->i_mtime = inode->i_atime = inode->i_ctime = 
current_time(inode);
+
+       hip = HFSPLUS_I(inode);
+       hfsplus_init_inode(hip);
         if (S_ISDIR(inode->i_mode)) {
                 inode->i_size = 2;
                 sbi->folder_count++;
                 inode->i_op = &hfsplus_dir_inode_operations;
...
```