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From faf869ce600f9ec25e6fa5eece611a311a9a2c65 Mon Sep 17 00:00:00 2001
From: ABC <abc@openwall.com>
Date: Wed, 18 Jan 2023 08:58:17 +0300
Subject: [PATCH 14/17] TCP Option 0 should participate in bitmask too
Fixes: a1386af ("tcp options: fix possible shift-out-of-bounds")
Signed-off-by: ABC <abc@openwall.com>
---
ipt_NETFLOW.c | 6 ++----
1 file changed, 2 insertions(+), 4 deletions(-)
diff --git a/ipt_NETFLOW.c b/ipt_NETFLOW.c
index a0119bb..e9c2567 100644
--- a/ipt_NETFLOW.c
+++ b/ipt_NETFLOW.c
@@ -4852,12 +4852,10 @@ static inline __u32 tcp_options(const struct sk_buff *skb, const unsigned int pt
for (i = 0; likely(i < optsize); ) {
u_int8_t opt = p[i++];
+ if (likely(opt < 32))
+ ret |= 1 << (31 - opt);
if (likely(opt == 0) || unlikely(p[i] < 2))
break;
- if (likely(opt < 32)) {
- /* IANA doc is messed up, see above. */
- ret |= 1 << (31 - opt);
- }
if (unlikely(opt == 1))
continue;
else
--
2.39.5
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