netfilter: xt_recent: avoid high order page allocations

xt_recent can try high order page allocations and this can fail.

iptables: page allocation failure: order:9, mode:0xc0d0

It also wastes about half the allocated space because of kmalloc()
power-of-two roundups and struct recent_table layout.

Use vmalloc() instead to save space and be less prone to allocation
errors when memory is fragmented.

Reported-by: Miroslav Kratochvil <exa.exa@gmail.com>
Reported-by: Dave Jones <davej@redhat.com>
Reported-by: Harald Reindl <h.reindl@thelounge.net>
Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

1 files changed, 18 insertions, 5 deletions

diff --git a/net/netfilter/xt_recent.c b/net/netfilter/xt_recent.c
index dab053e2a1a2..978efc9b555a 100644
--- a/net/netfilter/xt_recent.c
+++ b/net/netfilter/xt_recent.c
@@ -29,6 +29,7 @@
 #include <linux/skbuff.h>
 #include <linux/inet.h>
 #include <linux/slab.h>
+#include <linux/vmalloc.h>
 #include <net/net_namespace.h>
 #include <net/netns/generic.h>
 
@@ -310,6 +311,14 @@ out:
         return ret;
 }
 
+static void recent_table_free(void *addr)
+{
+        if (is_vmalloc_addr(addr))
+                vfree(addr);
+        else
+                kfree(addr);
+}
+
 static int recent_mt_check(const struct xt_mtchk_param *par,
                            const struct xt_recent_mtinfo_v1 *info)
 {
@@ -322,6 +331,7 @@ static int recent_mt_check(const struct xt_mtchk_param *par,
 #endif
         unsigned int i;
         int ret = -EINVAL;
+        size_t sz;
 
         if (unlikely(!hash_rnd_inited)) {
                 get_random_bytes(&hash_rnd, sizeof(hash_rnd));
@@ -360,8 +370,11 @@ static int recent_mt_check(const struct xt_mtchk_param *par,
                 goto out;
         }
 
-        t = kzalloc(sizeof(*t) + sizeof(t->iphash[0]) * ip_list_hash_size,
-                    GFP_KERNEL);
+        sz = sizeof(*t) + sizeof(t->iphash[0]) * ip_list_hash_size;
+        if (sz <= PAGE_SIZE)
+                t = kzalloc(sz, GFP_KERNEL);
+        else
+                t = vzalloc(sz);
         if (t == NULL) {
                 ret = -ENOMEM;
                 goto out;
@@ -377,14 +390,14 @@ static int recent_mt_check(const struct xt_mtchk_param *par,
         uid = make_kuid(&init_user_ns, ip_list_uid);
         gid = make_kgid(&init_user_ns, ip_list_gid);
         if (!uid_valid(uid) || !gid_valid(gid)) {
-                kfree(t);
+                recent_table_free(t);
                 ret = -EINVAL;
                 goto out;
         }
         pde = proc_create_data(t->name, ip_list_perms, recent_net->xt_recent,
                   &recent_mt_fops, t);
         if (pde == NULL) {
-                kfree(t);
+                recent_table_free(t);
                 ret = -ENOMEM;
                 goto out;
         }
@@ -435,7 +448,7 @@ static void recent_mt_destroy(const struct xt_mtdtor_param *par)
                         remove_proc_entry(t->name, recent_net->xt_recent);
 #endif
                 recent_table_flush(t);
-                kfree(t);
+                recent_table_free(t);
         }
         mutex_unlock(&recent_mutex);
 }