[NETFILTER]: Fix OOPSes on machines with discontiguous cpu numbering.
Original patch by Harald Welte, with feedback from Herbert Xu
and testing by Sébastien Bernard.
EBTABLES, ARP tables, and IP/IP6 tables all assume that cpus
are numbered linearly. That is not necessarily true.
This patch fixes that up by calculating the largest possible
cpu number, and allocating enough per-cpu structure space given
that.
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/ipv6/netfilter/ip6_tables.c b/net/ipv6/netfilter/ip6_tables.c
index 2da514b..b03e906 100644
--- a/net/ipv6/netfilter/ip6_tables.c
+++ b/net/ipv6/netfilter/ip6_tables.c
@@ -28,6 +28,7 @@
#include <asm/uaccess.h>
#include <asm/semaphore.h>
#include <linux/proc_fs.h>
+#include <linux/cpumask.h>
#include <linux/netfilter_ipv6/ip6_tables.h>
@@ -950,8 +951,10 @@
}
/* And one copy for every other CPU */
- for (i = 1; i < num_possible_cpus(); i++) {
- memcpy(newinfo->entries + SMP_ALIGN(newinfo->size)*i,
+ for_each_cpu(i) {
+ if (i == 0)
+ continue;
+ memcpy(newinfo->entries + SMP_ALIGN(newinfo->size) * i,
newinfo->entries,
SMP_ALIGN(newinfo->size));
}
@@ -973,6 +976,7 @@
unsigned int i;
for (i = 0; i < num_possible_cpus(); i++) {
+ for_each_cpu(i) {
table_base =
(void *)newinfo->entries
+ TABLE_OFFSET(newinfo, i);
@@ -1019,7 +1023,7 @@
unsigned int cpu;
unsigned int i;
- for (cpu = 0; cpu < num_possible_cpus(); cpu++) {
+ for_each_cpu(cpu) {
i = 0;
IP6T_ENTRY_ITERATE(t->entries + TABLE_OFFSET(t, cpu),
t->size,
@@ -1153,7 +1157,8 @@
return -ENOMEM;
newinfo = vmalloc(sizeof(struct ip6t_table_info)
- + SMP_ALIGN(tmp.size) * num_possible_cpus());
+ + SMP_ALIGN(tmp.size) *
+ (highest_possible_processor_id()+1));
if (!newinfo)
return -ENOMEM;
@@ -1467,7 +1472,8 @@
= { 0, 0, 0, { 0 }, { 0 }, { } };
newinfo = vmalloc(sizeof(struct ip6t_table_info)
- + SMP_ALIGN(repl->size) * num_possible_cpus());
+ + SMP_ALIGN(repl->size) *
+ (highest_possible_processor_id()+1));
if (!newinfo)
return -ENOMEM;