diff --git a/fs/ext4/sysfs.c b/fs/ext4/sysfs.c
index 6d332dff79dd..ca820620b974 100644
--- a/fs/ext4/sysfs.c
+++ b/fs/ext4/sysfs.c
@@ -104,7 +104,7 @@ static ssize_t reserved_clusters_store(struct ext4_sb_info *sbi,
 	int ret;
 
 	ret = kstrtoull(skip_spaces(buf), 0, &val);
-	if (ret || val >= clusters)
+	if (ret || val >= clusters || (s64)val < 0)
 		return -EINVAL;
 
 	atomic64_set(&sbi->s_resv_clusters, val);
@@ -451,7 +451,8 @@ static ssize_t ext4_attr_store(struct kobject *kobj,
 						s_kobj);
 	struct ext4_attr *a = container_of(attr, struct ext4_attr, attr);
 	void *ptr = calc_ptr(a, sbi);
-	unsigned long t;
+	unsigned int t;
+	unsigned long lt;
 	int ret;
 
 	switch (a->attr_id) {
@@ -460,7 +461,7 @@ static ssize_t ext4_attr_store(struct kobject *kobj,
 	case attr_pointer_ui:
 		if (!ptr)
 			return 0;
-		ret = kstrtoul(skip_spaces(buf), 0, &t);
+		ret = kstrtouint(skip_spaces(buf), 0, &t);
 		if (ret)
 			return ret;
 		if (a->attr_ptr == ptr_ext4_super_block_offset)
@@ -471,10 +472,10 @@ static ssize_t ext4_attr_store(struct kobject *kobj,
 	case attr_pointer_ul:
 		if (!ptr)
 			return 0;
-		ret = kstrtoul(skip_spaces(buf), 0, &t);
+		ret = kstrtoul(skip_spaces(buf), 0, &lt);
 		if (ret)
 			return ret;
-		*((unsigned long *) ptr) = t;
+		*((unsigned long *) ptr) = lt;
 		return len;
 	case attr_inode_readahead:
 		return inode_readahead_blks_store(sbi, buf, len);