linux-kernel - [PATCH 4.9 37/42] tipc: fix shift wrapping bug in map

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Message-Id: <20220913140344.252776985@linuxfoundation.org>
Date:   Tue, 13 Sep 2022 16:08:08 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Dan Carpenter <dan.carpenter@...cle.com>,
        "David S. Miller" <davem@...emloft.net>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 4.9 37/42] tipc: fix shift wrapping bug in map_get()

From: Dan Carpenter <dan.carpenter@...cle.com>

[ Upstream commit e2b224abd9bf45dcb55750479fc35970725a430b ]

There is a shift wrapping bug in this code so anything thing above
31 will return false.

Fixes: 35c55c9877f8 ("tipc: add neighbor monitoring framework")
Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 net/tipc/monitor.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/tipc/monitor.c b/net/tipc/monitor.c
index e1f4538b16532..7efcbd11a907a 100644
--- a/net/tipc/monitor.c
+++ b/net/tipc/monitor.c
@@ -130,7 +130,7 @@ static void map_set(u64 *up_map, int i, unsigned int v)
 
 static int map_get(u64 up_map, int i)
 {
-	return (up_map & (1 << i)) >> i;
+	return (up_map & (1ULL << i)) >> i;
 }
 
 static struct tipc_peer *peer_prev(struct tipc_peer *peer)
-- 
2.35.1