[PATCH 3.16 301/305] netfilter: x_tables: xt_compat_match_from_user doesn't need a retval

Ben Hutchings
2016-08-14T10:59:30Z

From: Florian Westphal <fw@strlen.de>

commit 0188346f21e6546498c2a0f84888797ad4063fc5 upstream.

Always returned 0.

Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
---
include/linux/netfilter/x_tables.h | 2 +-
net/ipv4/netfilter/arp_tables.c | 17 +++++------------
net/ipv4/netfilter/ip_tables.c | 26 +++++++++-----------------
net/ipv6/netfilter/ip6_tables.c | 27 +++++++++------------------
net/netfilter/x_tables.c | 5 ++---
5 files changed, 26 insertions(+), 51 deletions(-)

--- a/include/linux/netfilter/x_tables.h
+++ b/include/linux/netfilter/x_tables.h
@@ -425,7 +425,7 @@ void xt_compat_init_offsets(u_int8_t af,
int xt_compat_calc_jump(u_int8_t af, unsigned int offset);

int xt_compat_match_offset(const struct xt_match *match);
-int xt_compat_match_from_user(struct xt_entry_match *m, void **dstptr,
+void xt_compat_match_from_user(struct xt_entry_match *m, void **dstptr,
unsigned int *size);
int xt_compat_match_to_user(const struct xt_entry_match *m,
void __user **dstptr, unsigned int *size);
--- a/net/ipv4/netfilter/arp_tables.c
+++ b/net/ipv4/netfilter/arp_tables.c
@@ -1301,7 +1301,7 @@ out:
return ret;
}

-static int
+static void
compat_copy_entry_from_user(struct compat_arpt_entry *e, void **dstptr,
unsigned int *size,
struct xt_table_info *newinfo, unsigned char *base)
@@ -1310,9 +1310,8 @@ compat_copy_entry_from_user(struct compa
struct xt_target *target;
struct arpt_entry *de;
unsigned int origsize;
- int ret, h;
+ int h;

- ret = 0;
origsize = *size;
de = (struct arpt_entry *)*dstptr;
memcpy(de, e, sizeof(struct arpt_entry));
@@ -1333,7 +1332,6 @@ compat_copy_entry_from_user(struct compa
if ((unsigned char *)de - base < newinfo->underflow[h])
newinfo->underflow[h] -= origsize - *size;
}
- return ret;
}

static int translate_compat_table(struct xt_table_info **pinfo,
@@ -1412,16 +1410,11 @@ static int translate_compat_table(struct
entry1 = newinfo->entries[raw_smp_processor_id()];
pos = entry1;
size = compatr->size;
- xt_entry_foreach(iter0, entry0, compatr->size) {
- ret = compat_copy_entry_from_user(iter0, &pos, &size,
- newinfo, entry1);
- if (ret != 0)
- break;
- }
+ xt_entry_foreach(iter0, entry0, compatr->size)
+ compat_copy_entry_from_user(iter0, &pos, &size,
+ newinfo, entry1);
xt_compat_flush_offsets(NFPROTO_ARP);
xt_compat_unlock(NFPROTO_ARP);
- if (ret)
- goto free_newinfo;

ret = -ELOOP;
if (!mark_source_chains(newinfo, compatr->valid_hooks, entry1))
--- a/net/ipv4/netfilter/ip_tables.c
+++ b/net/ipv4/netfilter/ip_tables.c
@@ -1565,7 +1565,7 @@ release_matches:
return ret;
}

-static int
+static void
compat_copy_entry_from_user(struct compat_ipt_entry *e, void **dstptr,
unsigned int *size,
struct xt_table_info *newinfo, unsigned char *base)
@@ -1574,10 +1574,9 @@ compat_copy_entry_from_user(struct compa
struct xt_target *target;
struct ipt_entry *de;
unsigned int origsize;
- int ret, h;
+ int h;
struct xt_entry_match *ematch;

- ret = 0;
origsize = *size;
de = (struct ipt_entry *)*dstptr;
memcpy(de, e, sizeof(struct ipt_entry));
@@ -1586,11 +1585,9 @@ compat_copy_entry_from_user(struct compa
*dstptr += sizeof(struct ipt_entry);
*size += sizeof(struct ipt_entry) - sizeof(struct compat_ipt_entry);

- xt_ematch_foreach(ematch, e) {
- ret = xt_compat_match_from_user(ematch, dstptr, size);
- if (ret != 0)
- return ret;
- }
+ xt_ematch_foreach(ematch, e)
+ xt_compat_match_from_user(ematch, dstptr, size);
+
de->target_offset = e->target_offset - (origsize - *size);
t = compat_ipt_get_target(e);
target = t->u.kernel.target;
@@ -1603,7 +1600,6 @@ compat_copy_entry_from_user(struct compa
if ((unsigned char *)de - base < newinfo->underflow[h])
newinfo->underflow[h] -= origsize - *size;
}
- return ret;
}

static int
@@ -1719,16 +1715,12 @@ translate_compat_table(struct net *net,
entry1 = newinfo->entries[raw_smp_processor_id()];
pos = entry1;
size = compatr->size;
- xt_entry_foreach(iter0, entry0, compatr->size) {
- ret = compat_copy_entry_from_user(iter0, &pos, &size,
- newinfo, entry1);
- if (ret != 0)
- break;
- }
+ xt_entry_foreach(iter0, entry0, compatr->size)
+ compat_copy_entry_from_user(iter0, &pos, &size,
+ newinfo, entry1);
+
xt_compat_flush_offsets(AF_INET);
xt_compat_unlock(AF_INET);
- if (ret)
- goto free_newinfo;

ret = -ELOOP;
if (!mark_source_chains(newinfo, compatr->valid_hooks, entry1))
--- a/net/ipv6/netfilter/ip6_tables.c
+++ b/net/ipv6/netfilter/ip6_tables.c
@@ -1578,7 +1578,7 @@ release_matches:
return ret;
}

-static int
+static void
compat_copy_entry_from_user(struct compat_ip6t_entry *e, void **dstptr,
unsigned int *size,
struct xt_table_info *newinfo, unsigned char *base)
@@ -1586,10 +1586,9 @@ compat_copy_entry_from_user(struct compa
struct xt_entry_target *t;
struct ip6t_entry *de;
unsigned int origsize;
- int ret, h;
+ int h;
struct xt_entry_match *ematch;

- ret = 0;
origsize = *size;
de = (struct ip6t_entry *)*dstptr;
memcpy(de, e, sizeof(struct ip6t_entry));
@@ -1598,11 +1597,9 @@ compat_copy_entry_from_user(struct compa
*dstptr += sizeof(struct ip6t_entry);
*size += sizeof(struct ip6t_entry) - sizeof(struct compat_ip6t_entry);

- xt_ematch_foreach(ematch, e) {
- ret = xt_compat_match_from_user(ematch, dstptr, size);
- if (ret != 0)
- return ret;
- }
+ xt_ematch_foreach(ematch, e)
+ xt_compat_match_from_user(ematch, dstptr, size);
+
de->target_offset = e->target_offset - (origsize - *size);
t = compat_ip6t_get_target(e);
xt_compat_target_from_user(t, dstptr, size);
@@ -1614,7 +1611,6 @@ compat_copy_entry_from_user(struct compa
if ((unsigned char *)de - base < newinfo->underflow[h])
newinfo->underflow[h] -= origsize - *size;
}
- return ret;
}

static int compat_check_entry(struct ip6t_entry *e, struct net *net,
@@ -1729,17 +1725,12 @@ translate_compat_table(struct net *net,
}
entry1 = newinfo->entries[raw_smp_processor_id()];
pos = entry1;
- size = compatr->size;
- xt_entry_foreach(iter0, entry0, compatr->size) {
- ret = compat_copy_entry_from_user(iter0, &pos, &size,
- newinfo, entry1);
- if (ret != 0)
- break;
- }
+ xt_entry_foreach(iter0, entry0, compatr->size)
+ compat_copy_entry_from_user(iter0, &pos, &size,
+ newinfo, entry1);
+
xt_compat_flush_offsets(AF_INET6);
xt_compat_unlock(AF_INET6);
- if (ret)
- goto free_newinfo;

ret = -ELOOP;
if (!mark_source_chains(newinfo, compatr->valid_hooks, entry1))
--- a/net/netfilter/x_tables.c
+++ b/net/netfilter/x_tables.c
@@ -545,8 +545,8 @@ int xt_compat_match_offset(const struct
}
EXPORT_SYMBOL_GPL(xt_compat_match_offset);

-int xt_compat_match_from_user(struct xt_entry_match *m, void **dstptr,
- unsigned int *size)
+void xt_compat_match_from_user(struct xt_entry_match *m, void **dstptr,
+ unsigned int *size)
{
const struct xt_match *match = m->u.kernel.match;
struct compat_xt_entry_match *cm = (struct compat_xt_entry_match *)m;
@@ -568,7 +568,6 @@ int xt_compat_match_from_user(struct xt_

*size += off;
*dstptr += msize;
- return 0;
}
EXPORT_SYMBOL_GPL(xt_compat_match_from_user);