vfat: Fix vfat_find() error path in vfat_lookup()

Current vfat_lookup() creates negetive dentry blindly if vfat_find()
returned a error. It's wrong. If the error isn't -ENOENT, just return
error.

Signed-off-by: OGAWA Hirofumi <hirofumi@mail.parknet.co.jp>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/fs/fat/namei_vfat.c b/fs/fat/namei_vfat.c
index 1536bc3..419deab 100644 (file)
--- a/fs/fat/namei_vfat.c
+++ b/fs/fat/namei_vfat.c
@@ -683,7 +683,7 @@ static struct dentry *vfat_lookup(struct inode *dir, struct dentry *dentry,
 {
        struct super_block *sb = dir->i_sb;
        struct fat_slot_info sinfo;
-       struct inode *inode = NULL;
+       struct inode *inode;
        struct dentry *alias;
        int err, table;
 
@@ -693,14 +693,18 @@ static struct dentry *vfat_lookup(struct inode *dir, struct dentry *dentry,
 
        err = vfat_find(dir, &dentry->d_name, &sinfo);
        if (err) {
-               table++;
+               if (err == -ENOENT) {
+                       table++;
+                       inode = NULL;
+                       goto out;
+               }
                goto error;
        }
        inode = fat_build_inode(sb, sinfo.de, sinfo.i_pos);
        brelse(sinfo.bh);
        if (IS_ERR(inode)) {
-               unlock_super(sb);
-               return ERR_CAST(inode);
+               err = PTR_ERR(inode);
+               goto error;
        }
        alias = d_find_alias(inode);
        if (alias) {
@@ -713,7 +717,7 @@ static struct dentry *vfat_lookup(struct inode *dir, struct dentry *dentry,
                }
 
        }
-error:
+out:
        unlock_super(sb);
        dentry->d_op = &vfat_dentry_ops[table];
        dentry->d_time = dentry->d_parent->d_inode->i_version;
@@ -723,6 +727,10 @@ error:
                dentry->d_time = dentry->d_parent->d_inode->i_version;
        }
        return dentry;
+
+error:
+       unlock_super(sb);
+       return ERR_PTR(err);
 }
 
 static int vfat_create(struct inode *dir, struct dentry *dentry, int mode,