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tcp: check space before adding MPTCP SYN options

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Ensure there is enough space before adding MPTCP options in
tcp_syn_options().

Without this check, 'remaining' could underflow, and causes issues. If
there is not enough space, MPTCP should not be used.

Signed-off-by: MoYuanhao <moyuanhao3676@163.com>
Fixes: cec37a6e41 ("mptcp: Handle MP_CAPABLE options for outgoing connections")
Cc: stable@vger.kernel.org
Acked-by: Matthieu Baerts (NGI0) <matttbe@kernel.org>
[ Matt: Add Fixes, cc Stable, update Description ]
Signed-off-by: Matthieu Baerts (NGI0) <matttbe@kernel.org>
Reviewed-by: Eric Dumazet <edumazet@google.com>
Link: https://patch.msgid.link/20241209-net-mptcp-check-space-syn-v1-1-2da992bb6f74@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
MoYuanhao 2024-12-09 13:28:14 +01:00 committed by Jakub Kicinski
parent bbe4b41259
commit 06d64ab46f
1 changed files with 4 additions and 2 deletions
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6
net/ipv4/tcp_output.c
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@ -883,8 +883,10 @@ static unsigned int tcp_syn_options(struct sock *sk, struct sk_buff *skb,
unsigned int size; unsigned int size;
if (mptcp_syn_options(sk, skb, &size, &opts->mptcp)) { if (mptcp_syn_options(sk, skb, &size, &opts->mptcp)) {
opts->options |= OPTION_MPTCP; if (remaining >= size) {
remaining -= size; opts->options |= OPTION_MPTCP;
remaining -= size;
}
} }
} }