diff --git a/net/core/netpoll.c b/net/core/netpoll.c
index 77a0388fc3beccbf39187e357c7a1b4c93f09d73..12c129f726f94d7bd82402292b499da369aafc13 100644
--- a/net/core/netpoll.c
+++ b/net/core/netpoll.c
@@ -674,7 +674,8 @@ int netpoll_parse_options(struct netpoll *np, char *opt)
 		if ((delim = strchr(cur, '@')) == NULL)
 			goto parse_failed;
 		*delim = 0;
-		np->local_port = simple_strtol(cur, NULL, 10);
+		if (kstrtou16(cur, 10, &np->local_port))
+			goto parse_failed;
 		cur = delim;
 	}
 	cur++;
@@ -706,6 +707,8 @@ int netpoll_parse_options(struct netpoll *np, char *opt)
 		if (*cur == ' ' || *cur == '\t')
 			np_info(np, "warning: whitespace is not allowed\n");
 		np->remote_port = simple_strtol(cur, NULL, 10);
+		if (kstrtou16(cur, 10, &np->remote_port))
+			goto parse_failed;
 		cur = delim;
 	}
 	cur++;
diff --git a/net/ipv4/netfilter/ipt_CLUSTERIP.c b/net/ipv4/netfilter/ipt_CLUSTERIP.c
index fe5daea5214d9907bb742d0ee6e18ca900f07d16..75e33a7048f8b759eee7e4f8cf6729a194c1d3cd 100644
--- a/net/ipv4/netfilter/ipt_CLUSTERIP.c
+++ b/net/ipv4/netfilter/ipt_CLUSTERIP.c
@@ -661,6 +661,7 @@ static ssize_t clusterip_proc_write(struct file *file, const char __user *input,
 #define PROC_WRITELEN	10
 	char buffer[PROC_WRITELEN+1];
 	unsigned long nodenum;
+	int rc;
 
 	if (size > PROC_WRITELEN)
 		return -EIO;
@@ -669,11 +670,15 @@ static ssize_t clusterip_proc_write(struct file *file, const char __user *input,
 	buffer[size] = 0;
 
 	if (*buffer == '+') {
-		nodenum = simple_strtoul(buffer+1, NULL, 10);
+		rc = kstrtoul(buffer+1, 10, &nodenum);
+		if (rc)
+			return rc;
 		if (clusterip_add_node(c, nodenum))
 			return -ENOMEM;
 	} else if (*buffer == '-') {
-		nodenum = simple_strtoul(buffer+1, NULL,10);
+		rc = kstrtoul(buffer+1, 10, &nodenum);
+		if (rc)
+			return rc;
 		if (clusterip_del_node(c, nodenum))
 			return -ENOENT;
 	} else
diff --git a/net/mac80211/debugfs_sta.c b/net/mac80211/debugfs_sta.c
index 49a1c70bbd706232cc66b688391dbaf7a908b6d6..0dedb4bd962326755f15445556607d0004086144 100644
--- a/net/mac80211/debugfs_sta.c
+++ b/net/mac80211/debugfs_sta.c
@@ -221,6 +221,9 @@ static ssize_t sta_agg_status_write(struct file *file, const char __user *userbu
 		return -EINVAL;
 
 	tid = simple_strtoul(buf, NULL, 0);
+	ret = kstrtoul(buf, 0, &tid);
+	if (ret)
+		return ret;
 
 	if (tid >= IEEE80211_NUM_TIDS)
 		return -EINVAL;
diff --git a/net/netfilter/nf_conntrack_core.c b/net/netfilter/nf_conntrack_core.c
index af175166fffaf22558fb81bebbcdf59df6f0540d..37d9e628106d1a15f0d5dc2dfc7cde0a7082584e 100644
--- a/net/netfilter/nf_conntrack_core.c
+++ b/net/netfilter/nf_conntrack_core.c
@@ -1409,7 +1409,7 @@ EXPORT_SYMBOL_GPL(nf_ct_alloc_hashtable);
 
 int nf_conntrack_set_hashsize(const char *val, struct kernel_param *kp)
 {
-	int i, bucket;
+	int i, bucket, rc;
 	unsigned int hashsize, old_size;
 	struct hlist_nulls_head *hash, *old_hash;
 	struct nf_conntrack_tuple_hash *h;
@@ -1423,6 +1423,9 @@ int nf_conntrack_set_hashsize(const char *val, struct kernel_param *kp)
 		return param_set_uint(val, kp);
 
 	hashsize = simple_strtoul(val, NULL, 0);
+	rc = kstrtouint(val, 0, &hashsize);
+	if (rc)
+		return rc;
 	if (!hashsize)
 		return -EINVAL;