From 5c1aba467828bf0574ec5754c84884d573f590af Mon Sep 17 00:00:00 2001 From: Jozsef Kadlecsik Date: Sun, 20 Mar 2011 15:35:01 +0100 Subject: [PATCH] netfilter: ipset: fix checking the type revision at create command The revision of the set type was not checked at the create command: if the userspace sent a valid set type but with not supported revision number, it'd create a loop. Signed-off-by: Jozsef Kadlecsik Signed-off-by: Patrick McHardy --- net/netfilter/ipset/ip_set_core.c | 22 +++++++++++++++++----- 1 file changed, 17 insertions(+), 5 deletions(-) diff --git a/net/netfilter/ipset/ip_set_core.c b/net/netfilter/ipset/ip_set_core.c index 618a615acc9d..d6b48230a540 100644 --- a/net/netfilter/ipset/ip_set_core.c +++ b/net/netfilter/ipset/ip_set_core.c @@ -94,16 +94,28 @@ static int find_set_type_get(const char *name, u8 family, u8 revision, struct ip_set_type **found) { + struct ip_set_type *type; + int err; + rcu_read_lock(); *found = find_set_type(name, family, revision); if (*found) { - int err = !try_module_get((*found)->me); - rcu_read_unlock(); - return err ? -EFAULT : 0; + err = !try_module_get((*found)->me) ? -EFAULT : 0; + goto unlock; } + /* Make sure the type is loaded but we don't support the revision */ + list_for_each_entry_rcu(type, &ip_set_type_list, list) + if (STREQ(type->name, name)) { + err = -IPSET_ERR_FIND_TYPE; + goto unlock; + } rcu_read_unlock(); return try_to_load_type(name); + +unlock: + rcu_read_unlock(); + return err; } /* Find a given set type by name and family. @@ -116,7 +128,7 @@ find_set_type_minmax(const char *name, u8 family, u8 *min, u8 *max) struct ip_set_type *type; bool found = false; - *min = *max = 0; + *min = 255; *max = 0; rcu_read_lock(); list_for_each_entry_rcu(type, &ip_set_type_list, list) if (STREQ(type->name, name) && @@ -124,7 +136,7 @@ find_set_type_minmax(const char *name, u8 family, u8 *min, u8 *max) found = true; if (type->revision < *min) *min = type->revision; - else if (type->revision > *max) + if (type->revision > *max) *max = type->revision; } rcu_read_unlock(); -- 2.20.1