diff options
| -rw-r--r-- | include/linux/netfilter/xt_recent.h | 3 | ||||
| -rw-r--r-- | net/netfilter/xt_recent.c | 5 |
2 files changed, 8 insertions, 0 deletions
diff --git a/include/linux/netfilter/xt_recent.h b/include/linux/netfilter/xt_recent.h index bba990ecb018..83318e01425e 100644 --- a/include/linux/netfilter/xt_recent.h +++ b/include/linux/netfilter/xt_recent.h @@ -20,6 +20,9 @@ enum { /* Only allowed with --rcheck and --update */ #define XT_RECENT_MODIFIERS (XT_RECENT_TTL|XT_RECENT_REAP) +#define XT_RECENT_VALID_FLAGS (XT_RECENT_CHECK|XT_RECENT_SET|XT_RECENT_UPDATE|\ + XT_RECENT_REMOVE|XT_RECENT_TTL|XT_RECENT_REAP) + struct xt_recent_mtinfo { __u32 seconds; __u32 hit_count; diff --git a/net/netfilter/xt_recent.c b/net/netfilter/xt_recent.c index b65eca9e13a3..d2e7c80cd3c3 100644 --- a/net/netfilter/xt_recent.c +++ b/net/netfilter/xt_recent.c @@ -319,6 +319,11 @@ static bool recent_mt_check(const struct xt_mtchk_param *par) get_random_bytes(&hash_rnd, sizeof(hash_rnd)); hash_rnd_inited = true; } + if (info->check_set & ~XT_RECENT_VALID_FLAGS) { + pr_info(KBUILD_MODNAME ": Unsupported user space flags " + "(%08x)\n", info->check_set); + return false; + } if (hweight8(info->check_set & (XT_RECENT_SET | XT_RECENT_REMOVE | XT_RECENT_CHECK | XT_RECENT_UPDATE)) != 1) |