netfilter: x_tables: validate e->target_offset early

[android-x86/kernel.git] / net / ipv4 / netfilter / ip_tables.c

diff --git a/net/ipv4/netfilter/ip_tables.c b/net/ipv4/netfilter/ip_tables.c
index e53f8d6..1d72a3c 100644 (file)
--- a/net/ipv4/netfilter/ip_tables.c
+++ b/net/ipv4/netfilter/ip_tables.c
@@ -569,14 +569,12 @@ static void cleanup_match(struct xt_entry_match *m, struct net *net)
 }
 
 static int
-check_entry(const struct ipt_entry *e, const char *name)
+check_entry(const struct ipt_entry *e)
 {
        const struct xt_entry_target *t;
 
-       if (!ip_checkentry(&e->ip)) {
-               duprintf("ip check failed %p %s.\n", e, name);
+       if (!ip_checkentry(&e->ip))
                return -EINVAL;
-       }
 
        if (e->target_offset + sizeof(struct xt_entry_target) >
            e->next_offset)
@@ -666,10 +664,6 @@ find_check_entry(struct ipt_entry *e, struct net *net, const char *name,
        struct xt_mtchk_param mtpar;
        struct xt_entry_match *ematch;
 
-       ret = check_entry(e, name);
-       if (ret)
-               return ret;
-
        e->counters.pcnt = xt_percpu_counter_alloc();
        if (IS_ERR_VALUE(e->counters.pcnt))
                return -ENOMEM;
@@ -741,6 +735,7 @@ check_entry_size_and_hooks(struct ipt_entry *e,
                           unsigned int valid_hooks)
 {
        unsigned int h;
+       int err;
 
        if ((unsigned long)e % __alignof__(struct ipt_entry) != 0 ||
            (unsigned char *)e + sizeof(struct ipt_entry) >= limit) {
@@ -755,6 +750,10 @@ check_entry_size_and_hooks(struct ipt_entry *e,
                return -EINVAL;
        }
 
+       err = check_entry(e);
+       if (err)
+               return err;
+
        /* Check hooks & underflows */
        for (h = 0; h < NF_INET_NUMHOOKS; h++) {
                if (!(valid_hooks & (1 << h)))
@@ -1506,7 +1505,7 @@ check_compat_entry_size_and_hooks(struct compat_ipt_entry *e,
        }
 
        /* For purposes of check_entry casting the compat entry is fine */
-       ret = check_entry((struct ipt_entry *)e, name);
+       ret = check_entry((struct ipt_entry *)e);
        if (ret)
                return ret;