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 <[email protected]>
intel-lab-lkp · Nov 7, 2024 · deec21e · deec21e
1 parent 95505ae
commit deec21e
Showing 1 changed file with 2 additions and 2 deletions.
diff --git 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