From: Willem de Bruijn <willemb@xxxxxxxxxx>
Convert arptables to copying entries, matches and targets one by one,
using the xt_match_to_user and xt_target_to_user helper functions.
Signed-off-by: Willem de Bruijn <willemb@xxxxxxxxxx>
Signed-off-by: Pablo Neira Ayuso <pablo@xxxxxxxxxxxxx>
---
net/ipv4/netfilter/arp_tables.c | 15 +++++----------
1 file changed, 5 insertions(+), 10 deletions(-)
diff --git a/net/ipv4/netfilter/arp_tables.c b/net/ipv4/netfilter/arp_tables.c
index a467e1236c43..6241a81fd7f5 100644
--- a/net/ipv4/netfilter/arp_tables.c
+++ b/net/ipv4/netfilter/arp_tables.c
@@ -677,11 +677,6 @@ static int copy_entries_to_user(unsigned int total_size,
return PTR_ERR(counters);
loc_cpu_entry = private->entries;
- /* ... then copy entire thing ... */
- if (copy_to_user(userptr, loc_cpu_entry, total_size) != 0) {
- ret = -EFAULT;
- goto free_counters;
- }
/* FIXME: use iterator macros --RR */
/* ... then go back and fix counters and names */
@@ -689,6 +684,10 @@ static int copy_entries_to_user(unsigned int total_size,
const struct xt_entry_target *t;
e = (struct arpt_entry *)(loc_cpu_entry + off);
+ if (copy_to_user(userptr + off, e, sizeof(*e))) {
+ ret = -EFAULT;
+ goto free_counters;
+ }
if (copy_to_user(userptr + off
+ offsetof(struct arpt_entry, counters),
&counters[num],
@@ -698,11 +697,7 @@ static int copy_entries_to_user(unsigned int total_size,
}
t = arpt_get_target_c(e);
- if (copy_to_user(userptr + off + e->target_offset
- + offsetof(struct xt_entry_target,
- u.user.name),
- t->u.kernel.target->name,
- strlen(t->u.kernel.target->name)+1) != 0) {
+ if (xt_target_to_user(t, userptr + off + e->target_offset)) {
ret = -EFAULT;
goto free_counters;
}
--
2.1.4
--
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