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ipv6: Fix potential uninit-value access in __ip6_make_skb()

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[ Upstream commit 4e13d3a9c2 ]

As it was done in commit fc1092f515 ("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: ea30388bae ("ipv6: Fix an uninit variable access bug in __ip6_make_skb()")
Signed-off-by: Shigeru Yoshida <syoshida@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Shigeru Yoshida 2024-05-06 23:11:29 +09:00 committed by Greg Kroah-Hartman
parent 1ce60741d7
commit 68c8ba16ab
1 changed files with 1 additions and 1 deletions
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2
net/ipv6/ip6_output.c
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@ -2003,7 +2003,7 @@ 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;