[PATCH v2] netfilter: Clean up tests if NULL returned on failure

From: simran singhal
Date: Tue Mar 28 2017 - 09:15:46 EST

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Some functions like kmalloc/kzalloc return NULL on failure. When NULL
represents failure, !x is commonly used.

Signed-off-by: simran singhal <singhalsimran0@xxxxxxxxx>
---

v2:
-squash all the patches of the patch-set.

net/netfilter/ipvs/ip_vs_ctl.c | 4 ++--
net/netfilter/ipvs/ip_vs_dh.c | 2 +-
net/netfilter/ipvs/ip_vs_lblc.c | 2 +-
net/netfilter/ipvs/ip_vs_lblcr.c | 4 ++--
net/netfilter/ipvs/ip_vs_sh.c | 2 +-
net/netfilter/ipvs/ip_vs_wrr.c | 2 +-
net/netfilter/nf_conntrack_netlink.c | 2 +-
net/netfilter/nf_conntrack_proto.c | 2 +-
net/netfilter/nf_nat_core.c | 2 +-
net/netfilter/nf_tables_api.c | 24 ++++++++++++------------
net/netfilter/nfnetlink.c | 2 +-
net/netfilter/xt_TEE.c | 2 +-
12 files changed, 25 insertions(+), 25 deletions(-)

diff --git a/net/netfilter/ipvs/ip_vs_ctl.c b/net/netfilter/ipvs/ip_vs_ctl.c
index 5aeb0dd..efe348a 100644
--- a/net/netfilter/ipvs/ip_vs_ctl.c
+++ b/net/netfilter/ipvs/ip_vs_ctl.c
@@ -910,7 +910,7 @@ ip_vs_new_dest(struct ip_vs_service *svc, struct ip_vs_dest_user_kern *udest,
}

dest = kzalloc(sizeof(struct ip_vs_dest), GFP_KERNEL);
- if (dest == NULL)
+ if (!dest)
return -ENOMEM;

dest->stats.cpustats = alloc_percpu(struct ip_vs_cpu_stats);
@@ -1228,7 +1228,7 @@ ip_vs_add_service(struct netns_ipvs *ipvs, struct ip_vs_service_user_kern *u,
#endif

svc = kzalloc(sizeof(struct ip_vs_service), GFP_KERNEL);
- if (svc == NULL) {
+ if (!svc) {
IP_VS_DBG(1, "%s(): no memory\n", __func__);
ret = -ENOMEM;
goto out_err;
diff --git a/net/netfilter/ipvs/ip_vs_dh.c b/net/netfilter/ipvs/ip_vs_dh.c
index 75f798f..22a2535 100644
--- a/net/netfilter/ipvs/ip_vs_dh.c
+++ b/net/netfilter/ipvs/ip_vs_dh.c
@@ -159,7 +159,7 @@ static int ip_vs_dh_init_svc(struct ip_vs_service *svc)

/* allocate the DH table for this service */
s = kzalloc(sizeof(struct ip_vs_dh_state), GFP_KERNEL);
- if (s == NULL)
+ if (!s)
return -ENOMEM;

svc->sched_data = s;
diff --git a/net/netfilter/ipvs/ip_vs_lblc.c b/net/netfilter/ipvs/ip_vs_lblc.c
index 5824927..d7c6031 100644
--- a/net/netfilter/ipvs/ip_vs_lblc.c
+++ b/net/netfilter/ipvs/ip_vs_lblc.c
@@ -352,7 +352,7 @@ static int ip_vs_lblc_init_svc(struct ip_vs_service *svc)
* Allocate the ip_vs_lblc_table for this service
*/
tbl = kmalloc(sizeof(*tbl), GFP_KERNEL);
- if (tbl == NULL)
+ if (!tbl)
return -ENOMEM;

svc->sched_data = tbl;
diff --git a/net/netfilter/ipvs/ip_vs_lblcr.c b/net/netfilter/ipvs/ip_vs_lblcr.c
index 703f118..b0a9e1c 100644
--- a/net/netfilter/ipvs/ip_vs_lblcr.c
+++ b/net/netfilter/ipvs/ip_vs_lblcr.c
@@ -113,7 +113,7 @@ static void ip_vs_dest_set_insert(struct ip_vs_dest_set *set,
}

e = kmalloc(sizeof(*e), GFP_ATOMIC);
- if (e == NULL)
+ if (!e)
return;

ip_vs_dest_hold(dest);
@@ -515,7 +515,7 @@ static int ip_vs_lblcr_init_svc(struct ip_vs_service *svc)
* Allocate the ip_vs_lblcr_table for this service
*/
tbl = kmalloc(sizeof(*tbl), GFP_KERNEL);
- if (tbl == NULL)
+ if (!tbl)
return -ENOMEM;

svc->sched_data = tbl;
diff --git a/net/netfilter/ipvs/ip_vs_sh.c b/net/netfilter/ipvs/ip_vs_sh.c
index 16aaac6..99f3c3e 100644
--- a/net/netfilter/ipvs/ip_vs_sh.c
+++ b/net/netfilter/ipvs/ip_vs_sh.c
@@ -235,7 +235,7 @@ static int ip_vs_sh_init_svc(struct ip_vs_service *svc)

/* allocate the SH table for this service */
s = kzalloc(sizeof(struct ip_vs_sh_state), GFP_KERNEL);
- if (s == NULL)
+ if (!s)
return -ENOMEM;

svc->sched_data = s;
diff --git a/net/netfilter/ipvs/ip_vs_wrr.c b/net/netfilter/ipvs/ip_vs_wrr.c
index 17e6d44..0923e6c 100644
--- a/net/netfilter/ipvs/ip_vs_wrr.c
+++ b/net/netfilter/ipvs/ip_vs_wrr.c
@@ -116,7 +116,7 @@ static int ip_vs_wrr_init_svc(struct ip_vs_service *svc)
* Allocate the mark variable for WRR scheduling
*/
mark = kmalloc(sizeof(struct ip_vs_wrr_mark), GFP_KERNEL);
- if (mark == NULL)
+ if (!mark)
return -ENOMEM;

mark->cl = list_entry(&svc->destinations, struct ip_vs_dest, n_list);
diff --git a/net/netfilter/nf_conntrack_netlink.c b/net/netfilter/nf_conntrack_netlink.c
index 6806b5e..cdcf4c1 100644
--- a/net/netfilter/nf_conntrack_netlink.c
+++ b/net/netfilter/nf_conntrack_netlink.c
@@ -779,7 +779,7 @@ ctnetlink_alloc_filter(const struct nlattr * const cda[])
struct ctnetlink_filter *filter;

filter = kzalloc(sizeof(*filter), GFP_KERNEL);
- if (filter == NULL)
+ if (!filter)
return ERR_PTR(-ENOMEM);

filter->mark.val = ntohl(nla_get_be32(cda[CTA_MARK]));
diff --git a/net/netfilter/nf_conntrack_proto.c b/net/netfilter/nf_conntrack_proto.c
index 2d6ee18..48d8354 100644
--- a/net/netfilter/nf_conntrack_proto.c
+++ b/net/netfilter/nf_conntrack_proto.c
@@ -358,7 +358,7 @@ int nf_ct_l4proto_register_one(struct nf_conntrack_l4proto *l4proto)
proto_array = kmalloc(MAX_NF_CT_PROTO *
sizeof(struct nf_conntrack_l4proto *),
GFP_KERNEL);
- if (proto_array == NULL) {
+ if (!proto_array) {
ret = -ENOMEM;
goto out_unlock;
}
diff --git a/net/netfilter/nf_nat_core.c b/net/netfilter/nf_nat_core.c
index 94b14c5..922bd5b 100644
--- a/net/netfilter/nf_nat_core.c
+++ b/net/netfilter/nf_nat_core.c
@@ -626,7 +626,7 @@ int nf_nat_l4proto_register(u8 l3proto, const struct nf_nat_l4proto *l4proto)
if (nf_nat_l4protos[l3proto] == NULL) {
l4protos = kmalloc(IPPROTO_MAX * sizeof(struct nf_nat_l4proto *),
GFP_KERNEL);
- if (l4protos == NULL) {
+ if (!l4protos) {
ret = -ENOMEM;
goto out;
}
diff --git a/net/netfilter/nf_tables_api.c b/net/netfilter/nf_tables_api.c
index 434c739..b7645d7 100644
--- a/net/netfilter/nf_tables_api.c
+++ b/net/netfilter/nf_tables_api.c
@@ -117,7 +117,7 @@ static struct nft_trans *nft_trans_alloc_gfp(const struct nft_ctx *ctx,
struct nft_trans *trans;

trans = kzalloc(sizeof(struct nft_trans) + size, gfp);
- if (trans == NULL)
+ if (!trans)
return NULL;

trans->msg_type = msg_type;
@@ -720,7 +720,7 @@ static int nf_tables_newtable(struct net *net, struct sock *nlsk,

err = -ENOMEM;
table = kzalloc(sizeof(*table), GFP_KERNEL);
- if (table == NULL)
+ if (!table)
goto err2;

nla_strlcpy(table->name, name, NFT_TABLE_MAXNAMELEN);
@@ -1478,7 +1478,7 @@ static int nf_tables_newchain(struct net *net, struct sock *nlsk,
return err;

basechain = kzalloc(sizeof(*basechain), GFP_KERNEL);
- if (basechain == NULL) {
+ if (!basechain) {
nft_chain_release_hook(&hook);
return -ENOMEM;
}
@@ -1526,7 +1526,7 @@ static int nf_tables_newchain(struct net *net, struct sock *nlsk,
basechain->policy = policy;
} else {
chain = kzalloc(sizeof(*chain), GFP_KERNEL);
- if (chain == NULL)
+ if (!chain)
return -ENOMEM;
}

@@ -1800,7 +1800,7 @@ struct nft_expr *nft_expr_init(const struct nft_ctx *ctx,

err = -ENOMEM;
expr = kzalloc(info.ops->size, GFP_KERNEL);
- if (expr == NULL)
+ if (!expr)
goto err2;

err = nf_tables_newexpr(ctx, &info, expr);
@@ -2214,7 +2214,7 @@ static int nf_tables_newrule(struct net *net, struct sock *nlsk,

err = -ENOMEM;
rule = kzalloc(sizeof(*rule) + size + usize, GFP_KERNEL);
- if (rule == NULL)
+ if (!rule)
goto err1;

nft_activate_next(net, rule);
@@ -2810,7 +2810,7 @@ static int nf_tables_getset(struct net *net, struct sock *nlsk,
struct nft_ctx *ctx_dump;

ctx_dump = kmalloc(sizeof(*ctx_dump), GFP_KERNEL);
- if (ctx_dump == NULL)
+ if (!ctx_dump)
return -ENOMEM;

*ctx_dump = ctx;
@@ -3014,7 +3014,7 @@ static int nf_tables_newset(struct net *net, struct sock *nlsk,

err = -ENOMEM;
set = kzalloc(sizeof(*set) + size + udlen, GFP_KERNEL);
- if (set == NULL)
+ if (!set)
goto err1;

nla_strlcpy(name, nla[NFTA_SET_NAME], sizeof(set->name));
@@ -3541,7 +3541,7 @@ void *nft_set_elem_init(const struct nft_set *set,
void *elem;

elem = kzalloc(set->ops->elemsize + tmpl->len, gfp);
- if (elem == NULL)
+ if (!elem)
return NULL;

ext = nft_set_elem_ext(set, elem);
@@ -3995,7 +3995,7 @@ struct nft_set_gc_batch *nft_set_gc_batch_alloc(const struct nft_set *set,
struct nft_set_gc_batch *gcb;

gcb = kzalloc(sizeof(*gcb), gfp);
- if (gcb == NULL)
+ if (!gcb)
return gcb;
gcb->head.set = set;
return gcb;
@@ -4081,7 +4081,7 @@ static struct nft_object *nft_obj_init(const struct nft_object_type *type,

err = -ENOMEM;
obj = kzalloc(sizeof(struct nft_object) + type->size, GFP_KERNEL);
- if (obj == NULL)
+ if (!obj)
goto err1;

err = type->init((const struct nlattr * const *)tb, obj);
@@ -5563,7 +5563,7 @@ static int __init nf_tables_module_init(void)

info = kmalloc(sizeof(struct nft_expr_info) * NFT_RULE_MAXEXPRS,
GFP_KERNEL);
- if (info == NULL) {
+ if (!info) {
err = -ENOMEM;
goto err1;
}
diff --git a/net/netfilter/nfnetlink.c b/net/netfilter/nfnetlink.c
index 68eda920..c39f16c 100644
--- a/net/netfilter/nfnetlink.c
+++ b/net/netfilter/nfnetlink.c
@@ -232,7 +232,7 @@ static int nfnl_err_add(struct list_head *list, struct nlmsghdr *nlh, int err)
struct nfnl_err *nfnl_err;

nfnl_err = kmalloc(sizeof(struct nfnl_err), GFP_KERNEL);
- if (nfnl_err == NULL)
+ if (!nfnl_err)
return -ENOMEM;

nfnl_err->nlh = nlh;
diff --git a/net/netfilter/xt_TEE.c b/net/netfilter/xt_TEE.c
index 86b0580..5df3282 100644
--- a/net/netfilter/xt_TEE.c
+++ b/net/netfilter/xt_TEE.c
@@ -95,7 +95,7 @@ static int tee_tg_check(const struct xt_tgchk_param *par)
return -EINVAL;

priv = kzalloc(sizeof(*priv), GFP_KERNEL);
- if (priv == NULL)
+ if (!priv)
return -ENOMEM;

priv->tginfo = info;
--
2.7.4

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