From: Shigeru Yoshida <syoshida@redhat.com>
To: davem@davemloft.net, dsahern@kernel.org, edumazet@google.com,
kuba@kernel.org, pabeni@redhat.com
Cc: netdev@vger.kernel.org, linux-kernel@vger.kernel.org,
Shigeru Yoshida <syoshida@redhat.com>
Subject: [PATCH net] ipv6: Fix potential uninit-value access in __ip6_make_skb()
Date: Mon, 6 May 2024 23:11:29 +0900 [thread overview]
Message-ID: <20240506141129.2434319-1-syoshida@redhat.com> (raw)
As it was done in commit fc1092f51567 ("ipv4: Fix uninit-value access in
__ip_make_skb()") for IPv4, check FLOWI_FLAG_KNOWN_NH on fl6->flowi6_flags
instead of testing HDRINCL on the socket to avoid a race condition which
causes uninit-value access.
Fixes: ea30388baebc ("ipv6: Fix an uninit variable access bug in __ip6_make_skb()")
Signed-off-by: Shigeru Yoshida <syoshida@redhat.com>
---
net/ipv6/ip6_output.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/net/ipv6/ip6_output.c b/net/ipv6/ip6_output.c
index b9dd3a66e423..fa2937732665 100644
--- a/net/ipv6/ip6_output.c
+++ b/net/ipv6/ip6_output.c
@@ -1933,7 +1933,7 @@ struct sk_buff *__ip6_make_skb(struct sock *sk,
u8 icmp6_type;
if (sk->sk_socket->type == SOCK_RAW &&
- !inet_test_bit(HDRINCL, sk))
+ !(fl6->flowi6_flags & FLOWI_FLAG_KNOWN_NH))
icmp6_type = fl6->fl6_icmp_type;
else
icmp6_type = icmp6_hdr(skb)->icmp6_type;
--
2.44.0
next reply other threads:[~2024-05-06 14:11 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-05-06 14:11 Shigeru Yoshida [this message]
2024-05-08 11:30 ` patchwork-bot+netdevbpf
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