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Subject[PATCH 3.12 30/88] netfilter: x_tables: kill check_entry helper
Date
From: Florian Westphal <fw@strlen.de>

3.12-stable review patch. If anyone has any objections, please let me know.

===============

commit aa412ba225dd3bc36d404c28cdc3d674850d80d0 upstream.

Once we add more sanity testing to xt_check_entry_offsets it
becomes relvant if we're expecting a 32bit 'config_compat' blob
or a normal one.

Since we already have a lot of similar-named functions (check_entry,
compat_check_entry, find_and_check_entry, etc.) and the current
incarnation is short just fold its contents into the callers.

Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
---
net/ipv4/netfilter/arp_tables.c | 19 ++++++++-----------
net/ipv4/netfilter/ip_tables.c | 20 ++++++++------------
net/ipv6/netfilter/ip6_tables.c | 20 ++++++++------------
3 files changed, 24 insertions(+), 35 deletions(-)

diff --git a/net/ipv4/netfilter/arp_tables.c b/net/ipv4/netfilter/arp_tables.c
index 7232b8301ea9..99b28387ef6f 100644
--- a/net/ipv4/netfilter/arp_tables.c
+++ b/net/ipv4/netfilter/arp_tables.c
@@ -486,14 +486,6 @@ static int mark_source_chains(const struct xt_table_info *newinfo,
return 1;
}

-static inline int check_entry(const struct arpt_entry *e)
-{
- if (!arp_checkentry(&e->arp))
- return -EINVAL;
-
- return xt_check_entry_offsets(e, e->target_offset, e->next_offset);
-}
-
static inline int check_target(struct arpt_entry *e, const char *name)
{
struct xt_entry_target *t = arpt_get_target(e);
@@ -583,7 +575,10 @@ static inline int check_entry_size_and_hooks(struct arpt_entry *e,
return -EINVAL;
}

- err = check_entry(e);
+ if (!arp_checkentry(&e->arp))
+ return -EINVAL;
+
+ err = xt_check_entry_offsets(e, e->target_offset, e->next_offset);
if (err)
return err;

@@ -1242,8 +1237,10 @@ check_compat_entry_size_and_hooks(struct compat_arpt_entry *e,
return -EINVAL;
}

- /* For purposes of check_entry casting the compat entry is fine */
- ret = check_entry((struct arpt_entry *)e);
+ if (!arp_checkentry(&e->arp))
+ return -EINVAL;
+
+ ret = xt_check_entry_offsets(e, e->target_offset, e->next_offset);
if (ret)
return ret;

diff --git a/net/ipv4/netfilter/ip_tables.c b/net/ipv4/netfilter/ip_tables.c
index ce2ba7365434..f5fe7e66610b 100644
--- a/net/ipv4/netfilter/ip_tables.c
+++ b/net/ipv4/netfilter/ip_tables.c
@@ -580,15 +580,6 @@ static void cleanup_match(struct xt_entry_match *m, struct net *net)
}

static int
-check_entry(const struct ipt_entry *e)
-{
- if (!ip_checkentry(&e->ip))
- return -EINVAL;
-
- return xt_check_entry_offsets(e, e->target_offset, e->next_offset);
-}
-
-static int
check_match(struct xt_entry_match *m, struct xt_mtchk_param *par)
{
const struct ipt_ip *ip = par->entryinfo;
@@ -744,7 +735,10 @@ check_entry_size_and_hooks(struct ipt_entry *e,
return -EINVAL;
}

- err = check_entry(e);
+ if (!ip_checkentry(&e->ip))
+ return -EINVAL;
+
+ err = xt_check_entry_offsets(e, e->target_offset, e->next_offset);
if (err)
return err;

@@ -1508,8 +1502,10 @@ check_compat_entry_size_and_hooks(struct compat_ipt_entry *e,
return -EINVAL;
}

- /* For purposes of check_entry casting the compat entry is fine */
- ret = check_entry((struct ipt_entry *)e);
+ if (!ip_checkentry(&e->ip))
+ return -EINVAL;
+
+ ret = xt_check_entry_offsets(e, e->target_offset, e->next_offset);
if (ret)
return ret;

diff --git a/net/ipv6/netfilter/ip6_tables.c b/net/ipv6/netfilter/ip6_tables.c
index ac061d40f920..e9ee3feba843 100644
--- a/net/ipv6/netfilter/ip6_tables.c
+++ b/net/ipv6/netfilter/ip6_tables.c
@@ -589,15 +589,6 @@ static void cleanup_match(struct xt_entry_match *m, struct net *net)
module_put(par.match->me);
}

-static int
-check_entry(const struct ip6t_entry *e)
-{
- if (!ip6_checkentry(&e->ipv6))
- return -EINVAL;
-
- return xt_check_entry_offsets(e, e->target_offset, e->next_offset);
-}
-
static int check_match(struct xt_entry_match *m, struct xt_mtchk_param *par)
{
const struct ip6t_ip6 *ipv6 = par->entryinfo;
@@ -755,7 +746,10 @@ check_entry_size_and_hooks(struct ip6t_entry *e,
return -EINVAL;
}

- err = check_entry(e);
+ if (!ip6_checkentry(&e->ipv6))
+ return -EINVAL;
+
+ err = xt_check_entry_offsets(e, e->target_offset, e->next_offset);
if (err)
return err;

@@ -1520,8 +1514,10 @@ check_compat_entry_size_and_hooks(struct compat_ip6t_entry *e,
return -EINVAL;
}

- /* For purposes of check_entry casting the compat entry is fine */
- ret = check_entry((struct ip6t_entry *)e);
+ if (!ip6_checkentry(&e->ipv6))
+ return -EINVAL;
+
+ ret = xt_check_entry_offsets(e, e->target_offset, e->next_offset);
if (ret)
return ret;

--
2.9.1
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