netdev - [PATCH] mptcp: fix possible integer overflow in mptcp_reset_tout

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Message-ID: <20241107103657.1560536-1-d.kandybka@gmail.com>
Date: Thu,  7 Nov 2024 13:36:57 +0300
From: Dmitry Kandybka <d.kandybka@...il.com>
To: Matthieu Baerts <matttbe@...nel.org>
Cc: mptcp@...ts.linux.dev,
	netdev@...r.kernel.org,
	lvc-project@...uxtesting.org,
	Dmitry Antipov <dmantipov@...dex.ru>,
	Dmitry Kandybka <d.kandybka@...il.com>
Subject: [PATCH] mptcp: fix possible integer overflow in mptcp_reset_tout_timer

In 'mptcp_reset_tout_timer', promote 'probe_timestamp' to unsigned long
to avoid possible integer overflow. Compile tested only.

Found by Linux Verification Center (linuxtesting.org) with SVACE.

Signed-off-by: Dmitry Kandybka <d.kandybka@...il.com>
---
 net/mptcp/protocol.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/net/mptcp/protocol.c b/net/mptcp/protocol.c
index e978e05ec8d1..ff2b8a2bfe18 100644
--- a/net/mptcp/protocol.c
+++ b/net/mptcp/protocol.c
@@ -2722,8 +2722,8 @@ void mptcp_reset_tout_timer(struct mptcp_sock *msk, unsigned long fail_tout)
 	if (!fail_tout && !inet_csk(sk)->icsk_mtup.probe_timestamp)
 		return;
 
-	close_timeout = inet_csk(sk)->icsk_mtup.probe_timestamp - tcp_jiffies32 + jiffies +
-			mptcp_close_timeout(sk);
+	close_timeout = (unsigned long)inet_csk(sk)->icsk_mtup.probe_timestamp -
+			tcp_jiffies32 + jiffies + mptcp_close_timeout(sk);
 
 	/* the close timeout takes precedence on the fail one, and here at least one of
 	 * them is active
-- 
2.43.5