netfilter: x_tables: simplify IS_ERR_OR_NULL to NULL test

Since commit 7926dbfa4bc1 ("netfilter: don't use
mutex_lock_interruptible()"), the function xt_find_table_lock can only
return NULL on an error.  Simplify the call sites and update the
comment before the function.

The semantic patch that change the code is as follows:
(http://coccinelle.lip6.fr/)

// <smpl>
@@
expression t,e;
@@

t = \(xt_find_table_lock(...)\|
      try_then_request_module(xt_find_table_lock(...),...)\)
... when != t=e
- ! IS_ERR_OR_NULL(t)
+ t

@@
expression t,e;
@@

t = \(xt_find_table_lock(...)\|
      try_then_request_module(xt_find_table_lock(...),...)\)
... when != t=e
- IS_ERR_OR_NULL(t)
+ !t

@@
expression t,e,e1;
@@

t = \(xt_find_table_lock(...)\|
      try_then_request_module(xt_find_table_lock(...),...)\)
... when != t=e
?- t ? PTR_ERR(t) : e1
+ e1
... when any

// </smpl>

Signed-off-by: Julia Lawall <Julia.Lawall@lip6.fr>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

4 files changed, 31 insertions, 31 deletions

diff --git a/net/ipv4/netfilter/arp_tables.c b/net/ipv4/netfilter/arp_tables.c
index e76ab23a2deb..39004da318e2 100644
--- a/net/ipv4/netfilter/arp_tables.c
+++ b/net/ipv4/netfilter/arp_tables.c
@@ -805,7 +805,7 @@ static int get_info(struct net *net, void __user *user,
 #endif
         t = try_then_request_module(xt_find_table_lock(net, NFPROTO_ARP, name),
                                     "arptable_%s", name);
-        if (!IS_ERR_OR_NULL(t)) {
+        if (t) {
                 struct arpt_getinfo info;
                 const struct xt_table_info *private = t->private;
 #ifdef CONFIG_COMPAT
@@ -834,7 +834,7 @@ static int get_info(struct net *net, void __user *user,
                 xt_table_unlock(t);
                 module_put(t->me);
         } else
-                ret = t ? PTR_ERR(t) : -ENOENT;
+                ret = -ENOENT;
 #ifdef CONFIG_COMPAT
         if (compat)
                 xt_compat_unlock(NFPROTO_ARP);
@@ -859,7 +859,7 @@ static int get_entries(struct net *net, struct arpt_get_entries __user *uptr,
         get.name[sizeof(get.name) - 1] = '\0';
 
         t = xt_find_table_lock(net, NFPROTO_ARP, get.name);
-        if (!IS_ERR_OR_NULL(t)) {
+        if (t) {
                 const struct xt_table_info *private = t->private;
 
                 if (get.size == private->size)
@@ -871,7 +871,7 @@ static int get_entries(struct net *net, struct arpt_get_entries __user *uptr,
                 module_put(t->me);
                 xt_table_unlock(t);
         } else
-                ret = t ? PTR_ERR(t) : -ENOENT;
+                ret = -ENOENT;
 
         return ret;
 }
@@ -898,8 +898,8 @@ static int __do_replace(struct net *net, const char *name,
 
         t = try_then_request_module(xt_find_table_lock(net, NFPROTO_ARP, name),
                                     "arptable_%s", name);
-        if (IS_ERR_OR_NULL(t)) {
-                ret = t ? PTR_ERR(t) : -ENOENT;
+        if (!t) {
+                ret = -ENOENT;
                 goto free_newinfo_counters_untrans;
         }
 
@@ -1014,8 +1014,8 @@ static int do_add_counters(struct net *net, const void __user *user,
                 return PTR_ERR(paddc);
 
         t = xt_find_table_lock(net, NFPROTO_ARP, tmp.name);
-        if (IS_ERR_OR_NULL(t)) {
-                ret = t ? PTR_ERR(t) : -ENOENT;
+        if (!t) {
+                ret = -ENOENT;
                 goto free;
         }
 
@@ -1404,7 +1404,7 @@ static int compat_get_entries(struct net *net,
 
         xt_compat_lock(NFPROTO_ARP);
         t = xt_find_table_lock(net, NFPROTO_ARP, get.name);
-        if (!IS_ERR_OR_NULL(t)) {
+        if (t) {
                 const struct xt_table_info *private = t->private;
                 struct xt_table_info info;
 
@@ -1419,7 +1419,7 @@ static int compat_get_entries(struct net *net,
                 module_put(t->me);
                 xt_table_unlock(t);
         } else
-                ret = t ? PTR_ERR(t) : -ENOENT;
+                ret = -ENOENT;
 
         xt_compat_unlock(NFPROTO_ARP);
         return ret;
diff --git a/net/ipv4/netfilter/ip_tables.c b/net/ipv4/netfilter/ip_tables.c
index de4fa03f46f3..46815c8a60d7 100644
--- a/net/ipv4/netfilter/ip_tables.c
+++ b/net/ipv4/netfilter/ip_tables.c
@@ -973,7 +973,7 @@ static int get_info(struct net *net, void __user *user,
 #endif
         t = try_then_request_module(xt_find_table_lock(net, AF_INET, name),
                                     "iptable_%s", name);
-        if (!IS_ERR_OR_NULL(t)) {
+        if (t) {
                 struct ipt_getinfo info;
                 const struct xt_table_info *private = t->private;
 #ifdef CONFIG_COMPAT
@@ -1003,7 +1003,7 @@ static int get_info(struct net *net, void __user *user,
                 xt_table_unlock(t);
                 module_put(t->me);
         } else
-                ret = t ? PTR_ERR(t) : -ENOENT;
+                ret = -ENOENT;
 #ifdef CONFIG_COMPAT
         if (compat)
                 xt_compat_unlock(AF_INET);
@@ -1028,7 +1028,7 @@ get_entries(struct net *net, struct ipt_get_entries __user *uptr,
         get.name[sizeof(get.name) - 1] = '\0';
 
         t = xt_find_table_lock(net, AF_INET, get.name);
-        if (!IS_ERR_OR_NULL(t)) {
+        if (t) {
                 const struct xt_table_info *private = t->private;
                 if (get.size == private->size)
                         ret = copy_entries_to_user(private->size,
@@ -1039,7 +1039,7 @@ get_entries(struct net *net, struct ipt_get_entries __user *uptr,
                 module_put(t->me);
                 xt_table_unlock(t);
         } else
-                ret = t ? PTR_ERR(t) : -ENOENT;
+                ret = -ENOENT;
 
         return ret;
 }
@@ -1064,8 +1064,8 @@ __do_replace(struct net *net, const char *name, unsigned int valid_hooks,
 
         t = try_then_request_module(xt_find_table_lock(net, AF_INET, name),
                                     "iptable_%s", name);
-        if (IS_ERR_OR_NULL(t)) {
-                ret = t ? PTR_ERR(t) : -ENOENT;
+        if (!t) {
+                ret = -ENOENT;
                 goto free_newinfo_counters_untrans;
         }
 
@@ -1180,8 +1180,8 @@ do_add_counters(struct net *net, const void __user *user,
                 return PTR_ERR(paddc);
 
         t = xt_find_table_lock(net, AF_INET, tmp.name);
-        if (IS_ERR_OR_NULL(t)) {
-                ret = t ? PTR_ERR(t) : -ENOENT;
+        if (!t) {
+                ret = -ENOENT;
                 goto free;
         }
 
@@ -1626,7 +1626,7 @@ compat_get_entries(struct net *net, struct compat_ipt_get_entries __user *uptr,
 
         xt_compat_lock(AF_INET);
         t = xt_find_table_lock(net, AF_INET, get.name);
-        if (!IS_ERR_OR_NULL(t)) {
+        if (t) {
                 const struct xt_table_info *private = t->private;
                 struct xt_table_info info;
                 ret = compat_table_info(private, &info);
@@ -1640,7 +1640,7 @@ compat_get_entries(struct net *net, struct compat_ipt_get_entries __user *uptr,
                 module_put(t->me);
                 xt_table_unlock(t);
         } else
-                ret = t ? PTR_ERR(t) : -ENOENT;
+                ret = -ENOENT;
 
         xt_compat_unlock(AF_INET);
         return ret;
diff --git a/net/ipv6/netfilter/ip6_tables.c b/net/ipv6/netfilter/ip6_tables.c
index 7eac01d5d621..6ff42b8301cc 100644
--- a/net/ipv6/netfilter/ip6_tables.c
+++ b/net/ipv6/netfilter/ip6_tables.c
@@ -1003,7 +1003,7 @@ static int get_info(struct net *net, void __user *user,
 #endif
         t = try_then_request_module(xt_find_table_lock(net, AF_INET6, name),
                                     "ip6table_%s", name);
-        if (!IS_ERR_OR_NULL(t)) {
+        if (t) {
                 struct ip6t_getinfo info;
                 const struct xt_table_info *private = t->private;
 #ifdef CONFIG_COMPAT
@@ -1033,7 +1033,7 @@ static int get_info(struct net *net, void __user *user,
                 xt_table_unlock(t);
                 module_put(t->me);
         } else
-                ret = t ? PTR_ERR(t) : -ENOENT;
+                ret = -ENOENT;
 #ifdef CONFIG_COMPAT
         if (compat)
                 xt_compat_unlock(AF_INET6);
@@ -1059,7 +1059,7 @@ get_entries(struct net *net, struct ip6t_get_entries __user *uptr,
         get.name[sizeof(get.name) - 1] = '\0';
 
         t = xt_find_table_lock(net, AF_INET6, get.name);
-        if (!IS_ERR_OR_NULL(t)) {
+        if (t) {
                 struct xt_table_info *private = t->private;
                 if (get.size == private->size)
                         ret = copy_entries_to_user(private->size,
@@ -1070,7 +1070,7 @@ get_entries(struct net *net, struct ip6t_get_entries __user *uptr,
                 module_put(t->me);
                 xt_table_unlock(t);
         } else
-                ret = t ? PTR_ERR(t) : -ENOENT;
+                ret = -ENOENT;
 
         return ret;
 }
@@ -1095,8 +1095,8 @@ __do_replace(struct net *net, const char *name, unsigned int valid_hooks,
 
         t = try_then_request_module(xt_find_table_lock(net, AF_INET6, name),
                                     "ip6table_%s", name);
-        if (IS_ERR_OR_NULL(t)) {
-                ret = t ? PTR_ERR(t) : -ENOENT;
+        if (!t) {
+                ret = -ENOENT;
                 goto free_newinfo_counters_untrans;
         }
 
@@ -1210,8 +1210,8 @@ do_add_counters(struct net *net, const void __user *user, unsigned int len,
         if (IS_ERR(paddc))
                 return PTR_ERR(paddc);
         t = xt_find_table_lock(net, AF_INET6, tmp.name);
-        if (IS_ERR_OR_NULL(t)) {
-                ret = t ? PTR_ERR(t) : -ENOENT;
+        if (!t) {
+                ret = -ENOENT;
                 goto free;
         }
 
@@ -1647,7 +1647,7 @@ compat_get_entries(struct net *net, struct compat_ip6t_get_entries __user *uptr,
 
         xt_compat_lock(AF_INET6);
         t = xt_find_table_lock(net, AF_INET6, get.name);
-        if (!IS_ERR_OR_NULL(t)) {
+        if (t) {
                 const struct xt_table_info *private = t->private;
                 struct xt_table_info info;
                 ret = compat_table_info(private, &info);
@@ -1661,7 +1661,7 @@ compat_get_entries(struct net *net, struct compat_ip6t_get_entries __user *uptr,
                 module_put(t->me);
                 xt_table_unlock(t);
         } else
-                ret = t ? PTR_ERR(t) : -ENOENT;
+                ret = -ENOENT;
 
         xt_compat_unlock(AF_INET6);
         return ret;
diff --git a/net/netfilter/x_tables.c b/net/netfilter/x_tables.c
index fc4977456c30..ad818e52859b 100644
--- a/net/netfilter/x_tables.c
+++ b/net/netfilter/x_tables.c
@@ -982,7 +982,7 @@ void xt_free_table_info(struct xt_table_info *info)
 }
 EXPORT_SYMBOL(xt_free_table_info);
 
-/* Find table by name, grabs mutex & ref.  Returns ERR_PTR() on error. */
+/* Find table by name, grabs mutex & ref.  Returns NULL on error. */
 struct xt_table *xt_find_table_lock(struct net *net, u_int8_t af,
                                     const char *name)
 {