diff options
Diffstat (limited to 'net/ipv4/netfilter/ip_tables.c')
| -rw-r--r-- | net/ipv4/netfilter/ip_tables.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/net/ipv4/netfilter/ip_tables.c b/net/ipv4/netfilter/ip_tables.c index 2371b2062c2d8..16f47c675fefd 100644 --- a/net/ipv4/netfilter/ip_tables.c +++ b/net/ipv4/netfilter/ip_tables.c @@ -921,6 +921,13 @@ do_replace(void __user *user, unsigned int len) if (len != sizeof(tmp) + tmp.size) return -ENOPROTOOPT; + /* overflow check */ + if (tmp.size >= (INT_MAX - sizeof(struct xt_table_info)) / NR_CPUS - + SMP_CACHE_BYTES) + return -ENOMEM; + if (tmp.num_counters >= INT_MAX / sizeof(struct xt_counters)) + return -ENOMEM; + newinfo = xt_alloc_table_info(tmp.size); if (!newinfo) return -ENOMEM; |