fs/ntfs3: Allow repeated call to ntfs3_put_sbi

Signed-off-by: Konstantin Komarov <almaz.alexandrovich@paragon-software.com>

Author: aalexandrovich

fs/ntfs3/bitmap.c

@@ -125,6 +125,7 @@ void wnd_close(struct wnd_bitmap *wnd)
 	struct rb_node *node, *next;
 
 	kfree(wnd->free_bits);
+	wnd->free_bits = NULL;
 	run_close(&wnd->run);
 
 	node = rb_first(&wnd->start_tree);

fs/ntfs3/super.c

@@ -576,20 +576,30 @@ static noinline void ntfs3_put_sbi(struct ntfs_sb_info *sbi)
 	wnd_close(&sbi->mft.bitmap);
 	wnd_close(&sbi->used.bitmap);
 
-	if (sbi->mft.ni)
+	if (sbi->mft.ni) {
 		iput(&sbi->mft.ni->vfs_inode);
+		sbi->mft.ni = NULL;
+	}
 
-	if (sbi->security.ni)
+	if (sbi->security.ni) {
 		iput(&sbi->security.ni->vfs_inode);
+		sbi->security.ni = NULL;
+	}
 
-	if (sbi->reparse.ni)
+	if (sbi->reparse.ni) {
 		iput(&sbi->reparse.ni->vfs_inode);
+		sbi->reparse.ni = NULL;
+	}
 
-	if (sbi->objid.ni)
+	if (sbi->objid.ni) {
 		iput(&sbi->objid.ni->vfs_inode);
+		sbi->objid.ni = NULL;
+	}
 
-	if (sbi->volume.ni)
+	if (sbi->volume.ni) {
 		iput(&sbi->volume.ni->vfs_inode);
+		sbi->volume.ni = NULL;
+	}
 
 	ntfs_update_mftmirr(sbi, 0);
 
@@ -1577,6 +1587,7 @@ static int ntfs_fill_super(struct super_block *sb, struct fs_context *fc)
 	iput(inode);
 out:
 	kfree(boot2);
+	ntfs3_put_sbi(sbi);
 	return err;
 }