Merge to Fedora kernel-2.6.18-1.2255_FC5-vs2.0.2.2-rc9 patched with stable patch...

[linux-2.6.git] / net / ipv4 / netfilter / arp_tables.c

diff --git a/net/ipv4/netfilter/arp_tables.c b/net/ipv4/netfilter/arp_tables.c
index 8d1d7a6..8ba83e8 100644 (file)
--- a/net/ipv4/netfilter/arp_tables.c
+++ b/net/ipv4/netfilter/arp_tables.c
@@ -380,6 +380,13 @@ static int mark_source_chains(struct xt_table_info *newinfo,
                            && unconditional(&e->arp)) {
                                unsigned int oldpos, size;
 
+                               if (t->verdict < -NF_MAX_VERDICT - 1) {
+                                       duprintf("mark_source_chains: bad "
+                                               "negative verdict (%i)\n",
+                                                               t->verdict);
+                                       return 0;
+                               }
+
                                /* Return: backtrack through the last
                                 * big jump.
                                 */
@@ -409,6 +416,14 @@ static int mark_source_chains(struct xt_table_info *newinfo,
                                if (strcmp(t->target.u.user.name,
                                           ARPT_STANDARD_TARGET) == 0
                                    && newpos >= 0) {
+                                       if (newpos > newinfo->size -
+                                               sizeof(struct arpt_entry)) {
+                                               duprintf("mark_source_chains: "
+                                                       "bad verdict (%i)\n",
+                                                               newpos);
+                                               return 0;
+                                       }
+
                                        /* This a jump; chase it. */
                                        duprintf("Jump rule %u -> %u\n",
                                                 pos, newpos);
@@ -431,8 +446,6 @@ static int mark_source_chains(struct xt_table_info *newinfo,
 static inline int standard_check(const struct arpt_entry_target *t,
                                 unsigned int max_offset)
 {
-       struct arpt_standard_target *targ = (void *)t;
-
        /* Check standard info. */
        if (t->u.target_size
            != ARPT_ALIGN(sizeof(struct arpt_standard_target))) {
@@ -442,18 +455,6 @@ static inline int standard_check(const struct arpt_entry_target *t,
                return 0;
        }
 
-       if (targ->verdict >= 0
-           && targ->verdict > max_offset - sizeof(struct arpt_entry)) {
-               duprintf("arpt_standard_check: bad verdict (%i)\n",
-                        targ->verdict);
-               return 0;
-       }
-
-       if (targ->verdict < -NF_MAX_VERDICT - 1) {
-               duprintf("arpt_standard_check: bad negative verdict (%i)\n",
-                        targ->verdict);
-               return 0;
-       }
        return 1;
 }
 
@@ -471,7 +472,13 @@ static inline int check_entry(struct arpt_entry *e, const char *name, unsigned i
                return -EINVAL;
        }
 
+       if (e->target_offset + sizeof(struct arpt_entry_target) > e->next_offset)
+               return -EINVAL;
+
        t = arpt_get_target(e);
+       if (e->target_offset + t->u.target_size > e->next_offset)
+               return -EINVAL;
+
        target = try_then_request_module(xt_find_target(NF_ARP, t->u.user.name,
                                                        t->u.user.revision),
                                         "arpt_%s", t->u.user.name);
@@ -641,7 +648,7 @@ static int translate_table(const char *name,
 
        if (ret != 0) {
                ARPT_ENTRY_ITERATE(entry0, newinfo->size,
-                                  cleanup_entry, &i);
+                               cleanup_entry, &i);
                return ret;
        }
 
@@ -1204,6 +1211,8 @@ err1:
 static void __exit arp_tables_fini(void)
 {
        nf_unregister_sockopt(&arpt_sockopts);
+       xt_unregister_target(&arpt_error_target);
+       xt_unregister_target(&arpt_standard_target);
        xt_proto_fini(NF_ARP);
 }