From: Tim Gardner <tim.gardner@xxxxxxxxxxxxx>
Signed-off-by: Tim Gardner <tim.gardner@xxxxxxxxxxxxx>
Signed-off-by: Patrick McHardy <kaber@xxxxxxxxx>
---
include/linux/netfilter/xt_recent.h | 3 +++
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 bba990e..83318e0 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 b65eca9..d2e7c80 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)
--
1.7.0.4
--
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