hfsplus: fix longname handling

Longname is not correctly handled by hfsplus driver.  If an attempt to
create a longname(>255) file/directory is made, it succeeds by creating a
file/directory with HFSPLUS_MAX_STRLEN and incorrect catalog key.  Thus
leaving the volume in an inconsistent state.  This patch fixes this issue.

Although lookup is always called first to create a negative entry, so just
doing a check in lookup would probably fix this issue.  I choose to
propagate error to other iops as well.

Please NOTE: I have factored out hfsplus_cat_build_key_with_cnid from
hfsplus_cat_build_key, to avoid unncessary branching.

Thanks a lot.

  TEST:
  ------
  dir="TEST_DIR"
  cdir=`pwd`
  name255="_123456789_123456789_123456789_123456789_123456789_123456789\
  _123456789_123456789_123456789_123456789_123456789_123456789_123456789\
  _123456789_123456789_123456789_123456789_123456789_123456789_123456789\
  _123456789_123456789_123456789_123456789_123456789_1234"
  name256="${name255}5"

  mkdir $dir
  cd $dir
  touch $name255
  rm -f $name255
  touch $name256
  ls -la
  cd $cdir
  rm -rf $dir

  RESULT:
  -------
  [sougata@ultrabook tmp]$ cdir=`pwd`
  [sougata@ultrabook tmp]$
  name255="_123456789_123456789_123456789_123456789_123456789_123456789\
   > _123456789_123456789_123456789_123456789_123456789_123456789_123456789\
   > _123456789_123456789_123456789_123456789_123456789_123456789_123456789\
   > _123456789_123456789_123456789_123456789_123456789_1234"
  [sougata@ultrabook tmp]$ name256="${name255}5"
  [sougata@ultrabook tmp]$
  [sougata@ultrabook tmp]$ mkdir $dir
  [sougata@ultrabook tmp]$ cd $dir
  [sougata@ultrabook TEST_DIR]$ touch $name255
  [sougata@ultrabook TEST_DIR]$ rm -f $name255
  [sougata@ultrabook TEST_DIR]$ touch $name256
  [sougata@ultrabook TEST_DIR]$ ls -la
  ls: cannot access
  _123456789_123456789_123456789_123456789_123456789_123456789_123456789_123456789_123456789_123456789_123456789_123456789_123456789_123456789_123456789_123456789_123456789_123456789_123456789_123456789_123456789_123456789_123456789_123456789_123456789_1234:
  No such file or directory
  total 0
  drwxrwxr-x 1 sougata sougata 3 Feb 20 19:56 .
  drwxrwxrwx 1 root    root    6 Feb 20 19:56 ..
  -????????? ? ?       ?       ?            ?
  _123456789_123456789_123456789_123456789_123456789_123456789_123456789_123456789_123456789_123456789_123456789_123456789_123456789_123456789_123456789_123456789_123456789_123456789_123456789_123456789_123456789_123456789_123456789_123456789_123456789_1234
  [sougata@ultrabook TEST_DIR]$ cd $cdir
  [sougata@ultrabook tmp]$ rm -rf $dir
  rm: cannot remove `TEST_DIR': Directory not empty

-ENAMETOOLONG returned from hfsplus_asc2uni was not propaged to iops.
This allowed hfsplus to create files/directories with HFSPLUS_MAX_STRLEN
and incorrect keys, leaving the FS in an inconsistent state.  This patch
fixes this issue.

Signed-off-by: Sougata Santra <sougata@tuxera.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Cc: Vyacheslav Dubeyko <slava@dubeyko.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

4 files changed, 79 insertions, 29 deletions

diff --git a/fs/hfsplus/catalog.c b/fs/hfsplus/catalog.c
index 32602c667b4a..7892e6fddb66 100644
--- a/fs/hfsplus/catalog.c
+++ b/fs/hfsplus/catalog.c
@@ -38,21 +38,30 @@ int hfsplus_cat_bin_cmp_key(const hfsplus_btree_key *k1,
         return hfsplus_strcmp(&k1->cat.name, &k2->cat.name);
 }
 
-void hfsplus_cat_build_key(struct super_block *sb, hfsplus_btree_key *key,
-                           u32 parent, struct qstr *str)
+/* Generates key for catalog file/folders record. */
+int hfsplus_cat_build_key(struct super_block *sb,
+                hfsplus_btree_key *key, u32 parent, struct qstr *str)
 {
-        int len;
+        int len, err;
 
         key->cat.parent = cpu_to_be32(parent);
-        if (str) {
-                hfsplus_asc2uni(sb, &key->cat.name, HFSPLUS_MAX_STRLEN,
-                                        str->name, str->len);
-                len = be16_to_cpu(key->cat.name.length);
-        } else {
-                key->cat.name.length = 0;
-                len = 0;
-        }
+        err = hfsplus_asc2uni(sb, &key->cat.name, HFSPLUS_MAX_STRLEN,
+                        str->name, str->len);
+        if (unlikely(err < 0))
+                return err;
+
+        len = be16_to_cpu(key->cat.name.length);
         key->key_len = cpu_to_be16(6 + 2 * len);
+        return 0;
+}
+
+/* Generates key for catalog thread record. */
+void hfsplus_cat_build_key_with_cnid(struct super_block *sb,
+                        hfsplus_btree_key *key, u32 parent)
+{
+        key->cat.parent = cpu_to_be32(parent);
+        key->cat.name.length = 0;
+        key->key_len = cpu_to_be16(6);
 }
 
 static void hfsplus_cat_build_key_uni(hfsplus_btree_key *key, u32 parent,
@@ -167,11 +176,16 @@ static int hfsplus_fill_cat_thread(struct super_block *sb,
                                    hfsplus_cat_entry *entry, int type,
                                    u32 parentid, struct qstr *str)
 {
+        int err;
+
         entry->type = cpu_to_be16(type);
         entry->thread.reserved = 0;
         entry->thread.parentID = cpu_to_be32(parentid);
-        hfsplus_asc2uni(sb, &entry->thread.nodeName, HFSPLUS_MAX_STRLEN,
+        err = hfsplus_asc2uni(sb, &entry->thread.nodeName, HFSPLUS_MAX_STRLEN,
                                 str->name, str->len);
+        if (unlikely(err < 0))
+                return err;
+
         return 10 + be16_to_cpu(entry->thread.nodeName.length) * 2;
 }
 
@@ -183,7 +197,7 @@ int hfsplus_find_cat(struct super_block *sb, u32 cnid,
         int err;
         u16 type;
 
-        hfsplus_cat_build_key(sb, fd->search_key, cnid, NULL);
+        hfsplus_cat_build_key_with_cnid(sb, fd->search_key, cnid);
         err = hfs_brec_read(fd, &tmp, sizeof(hfsplus_cat_entry));
         if (err)
                 return err;
@@ -250,11 +264,16 @@ int hfsplus_create_cat(u32 cnid, struct inode *dir,
         if (err)
                 return err;
 
-        hfsplus_cat_build_key(sb, fd.search_key, cnid, NULL);
+        hfsplus_cat_build_key_with_cnid(sb, fd.search_key, cnid);
         entry_size = hfsplus_fill_cat_thread(sb, &entry,
                 S_ISDIR(inode->i_mode) ?
                         HFSPLUS_FOLDER_THREAD : HFSPLUS_FILE_THREAD,
                 dir->i_ino, str);
+        if (unlikely(entry_size < 0)) {
+                err = entry_size;
+                goto err2;
+        }
+
         err = hfs_brec_find(&fd, hfs_find_rec_by_key);
         if (err != -ENOENT) {
                 if (!err)
@@ -265,7 +284,10 @@ int hfsplus_create_cat(u32 cnid, struct inode *dir,
         if (err)
                 goto err2;
 
-        hfsplus_cat_build_key(sb, fd.search_key, dir->i_ino, str);
+        err = hfsplus_cat_build_key(sb, fd.search_key, dir->i_ino, str);
+        if (unlikely(err))
+                goto err1;
+
         entry_size = hfsplus_cat_build_record(&entry, cnid, inode);
         err = hfs_brec_find(&fd, hfs_find_rec_by_key);
         if (err != -ENOENT) {
@@ -288,7 +310,7 @@ int hfsplus_create_cat(u32 cnid, struct inode *dir,
         return 0;
 
 err1:
-        hfsplus_cat_build_key(sb, fd.search_key, cnid, NULL);
+        hfsplus_cat_build_key_with_cnid(sb, fd.search_key, cnid);
         if (!hfs_brec_find(&fd, hfs_find_rec_by_key))
                 hfs_brec_remove(&fd);
 err2:
@@ -313,7 +335,7 @@ int hfsplus_delete_cat(u32 cnid, struct inode *dir, struct qstr *str)
         if (!str) {
                 int len;
 
-                hfsplus_cat_build_key(sb, fd.search_key, cnid, NULL);
+                hfsplus_cat_build_key_with_cnid(sb, fd.search_key, cnid);
                 err = hfs_brec_find(&fd, hfs_find_rec_by_key);
                 if (err)
                         goto out;
@@ -329,7 +351,9 @@ int hfsplus_delete_cat(u32 cnid, struct inode *dir, struct qstr *str)
                         off + 2, len);
                 fd.search_key->key_len = cpu_to_be16(6 + len);
         } else
-                hfsplus_cat_build_key(sb, fd.search_key, dir->i_ino, str);
+                err = hfsplus_cat_build_key(sb, fd.search_key, dir->i_ino, str);
+                if (unlikely(err))
+                        goto out;
 
         err = hfs_brec_find(&fd, hfs_find_rec_by_key);
         if (err)
@@ -360,7 +384,7 @@ int hfsplus_delete_cat(u32 cnid, struct inode *dir, struct qstr *str)
         if (err)
                 goto out;
 
-        hfsplus_cat_build_key(sb, fd.search_key, cnid, NULL);
+        hfsplus_cat_build_key_with_cnid(sb, fd.search_key, cnid);
         err = hfs_brec_find(&fd, hfs_find_rec_by_key);
         if (err)
                 goto out;
@@ -405,7 +429,11 @@ int hfsplus_rename_cat(u32 cnid,
         dst_fd = src_fd;
 
         /* find the old dir entry and read the data */
-        hfsplus_cat_build_key(sb, src_fd.search_key, src_dir->i_ino, src_name);
+        err = hfsplus_cat_build_key(sb, src_fd.search_key,
+                        src_dir->i_ino, src_name);
+        if (unlikely(err))
+                goto out;
+
         err = hfs_brec_find(&src_fd, hfs_find_rec_by_key);
         if (err)
                 goto out;
@@ -419,7 +447,11 @@ int hfsplus_rename_cat(u32 cnid,
         type = be16_to_cpu(entry.type);
 
         /* create new dir entry with the data from the old entry */
-        hfsplus_cat_build_key(sb, dst_fd.search_key, dst_dir->i_ino, dst_name);
+        err = hfsplus_cat_build_key(sb, dst_fd.search_key,
+                        dst_dir->i_ino, dst_name);
+        if (unlikely(err))
+                goto out;
+
         err = hfs_brec_find(&dst_fd, hfs_find_rec_by_key);
         if (err != -ENOENT) {
                 if (!err)
@@ -436,7 +468,11 @@ int hfsplus_rename_cat(u32 cnid,
         dst_dir->i_mtime = dst_dir->i_ctime = CURRENT_TIME_SEC;
 
         /* finally remove the old entry */
-        hfsplus_cat_build_key(sb, src_fd.search_key, src_dir->i_ino, src_name);
+        err = hfsplus_cat_build_key(sb, src_fd.search_key,
+                        src_dir->i_ino, src_name);
+        if (unlikely(err))
+                goto out;
+
         err = hfs_brec_find(&src_fd, hfs_find_rec_by_key);
         if (err)
                 goto out;
@@ -449,7 +485,7 @@ int hfsplus_rename_cat(u32 cnid,
         src_dir->i_mtime = src_dir->i_ctime = CURRENT_TIME_SEC;
 
         /* remove old thread entry */
-        hfsplus_cat_build_key(sb, src_fd.search_key, cnid, NULL);
+        hfsplus_cat_build_key_with_cnid(sb, src_fd.search_key, cnid);
         err = hfs_brec_find(&src_fd, hfs_find_rec_by_key);
         if (err)
                 goto out;
@@ -459,9 +495,14 @@ int hfsplus_rename_cat(u32 cnid,
                 goto out;
 
         /* create new thread entry */
-        hfsplus_cat_build_key(sb, dst_fd.search_key, cnid, NULL);
+        hfsplus_cat_build_key_with_cnid(sb, dst_fd.search_key, cnid);
         entry_size = hfsplus_fill_cat_thread(sb, &entry, type,
                 dst_dir->i_ino, dst_name);
+        if (unlikely(entry_size < 0)) {
+                err = entry_size;
+                goto out;
+        }
+
         err = hfs_brec_find(&dst_fd, hfs_find_rec_by_key);
         if (err != -ENOENT) {
                 if (!err)
diff --git a/fs/hfsplus/dir.c b/fs/hfsplus/dir.c
index 610a3260bef1..435bea231cc6 100644
--- a/fs/hfsplus/dir.c
+++ b/fs/hfsplus/dir.c
@@ -44,7 +44,10 @@ static struct dentry *hfsplus_lookup(struct inode *dir, struct dentry *dentry,
         err = hfs_find_init(HFSPLUS_SB(sb)->cat_tree, &fd);
         if (err)
                 return ERR_PTR(err);
-        hfsplus_cat_build_key(sb, fd.search_key, dir->i_ino, &dentry->d_name);
+        err = hfsplus_cat_build_key(sb, fd.search_key, dir->i_ino,
+                        &dentry->d_name);
+        if (unlikely(err < 0))
+                goto fail;
 again:
         err = hfs_brec_read(&fd, &entry, sizeof(entry));
         if (err) {
@@ -97,9 +100,11 @@ again:
                                         be32_to_cpu(entry.file.permissions.dev);
                                 str.len = sprintf(name, "iNode%d", linkid);
                                 str.name = name;
-                                hfsplus_cat_build_key(sb, fd.search_key,
+                                err = hfsplus_cat_build_key(sb, fd.search_key,
                                         HFSPLUS_SB(sb)->hidden_dir->i_ino,
                                         &str);
+                                if (unlikely(err < 0))
+                                        goto fail;
                                 goto again;
                         }
                 } else if (!dentry->d_fsdata)
@@ -145,7 +150,7 @@ static int hfsplus_readdir(struct file *file, struct dir_context *ctx)
                 err = -ENOMEM;
                 goto out;
         }
-        hfsplus_cat_build_key(sb, fd.search_key, inode->i_ino, NULL);
+        hfsplus_cat_build_key_with_cnid(sb, fd.search_key, inode->i_ino);
         err = hfs_brec_find(&fd, hfs_find_rec_by_key);
         if (err)
                 goto out;
diff --git a/fs/hfsplus/hfsplus_fs.h b/fs/hfsplus/hfsplus_fs.h
index eb5e059f481a..b0441d65fa54 100644
--- a/fs/hfsplus/hfsplus_fs.h
+++ b/fs/hfsplus/hfsplus_fs.h
@@ -443,8 +443,10 @@ int hfsplus_cat_case_cmp_key(const hfsplus_btree_key *k1,
                              const hfsplus_btree_key *k2);
 int hfsplus_cat_bin_cmp_key(const hfsplus_btree_key *k1,
                             const hfsplus_btree_key *k2);
-void hfsplus_cat_build_key(struct super_block *sb, hfsplus_btree_key *key,
+int hfsplus_cat_build_key(struct super_block *sb, hfsplus_btree_key *key,
                            u32 parent, struct qstr *str);
+void hfsplus_cat_build_key_with_cnid(struct super_block *sb,
+                                     hfsplus_btree_key *key, u32 parent);
 void hfsplus_cat_set_perms(struct inode *inode, struct hfsplus_perm *perms);
 int hfsplus_find_cat(struct super_block *sb, u32 cnid,
                      struct hfs_find_data *fd);
diff --git a/fs/hfsplus/super.c b/fs/hfsplus/super.c
index 4cf2024b87da..593af2fdcc2d 100644
--- a/fs/hfsplus/super.c
+++ b/fs/hfsplus/super.c
@@ -515,7 +515,9 @@ static int hfsplus_fill_super(struct super_block *sb, void *data, int silent)
         err = hfs_find_init(sbi->cat_tree, &fd);
         if (err)
                 goto out_put_root;
-        hfsplus_cat_build_key(sb, fd.search_key, HFSPLUS_ROOT_CNID, &str);
+        err = hfsplus_cat_build_key(sb, fd.search_key, HFSPLUS_ROOT_CNID, &str);
+        if (unlikely(err < 0))
+                goto out_put_root;
         if (!hfs_brec_read(&fd, &entry, sizeof(entry))) {
                 hfs_find_exit(&fd);
                 if (entry.type != cpu_to_be16(HFSPLUS_FOLDER))