diff --git a/fs/ext4/super.c b/fs/ext4/super.c
index 4550b83..3c1397f 100644
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -2698,8 +2698,11 @@
 
 	handle = ext4_journal_start(dquot_to_inode(dquot),
 					EXT4_QUOTA_DEL_BLOCKS(dquot->dq_sb));
-	if (IS_ERR(handle))
+	if (IS_ERR(handle)) {
+		/* Release dquot anyway to avoid endless cycle in dqput() */
+		dquot_release(dquot);
 		return PTR_ERR(handle);
+	}
 	ret = dquot_release(dquot);
 	err = ext4_journal_stop(handle);
 	if (!ret)
@@ -2832,6 +2835,12 @@
 	struct buffer_head *bh;
 	handle_t *handle = journal_current_handle();
 
+	if (!handle) {
+		printk(KERN_WARNING "EXT4-fs: Quota write (off=%Lu, len=%Lu)"
+			" cancelled because transaction is not started.\n",
+			(unsigned long long)off, (unsigned long long)len);
+		return -EIO;
+	}
 	mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA);
 	while (towrite > 0) {
 		tocopy = sb->s_blocksize - offset < towrite ?