From: "Radu Pirea (OSS)" <radu-nicolae.pirea@oss.nxp.com>
To: andrew@lunn.ch, hkallweit1@gmail.com, linux@armlinux.org.uk,
davem@davemloft.net, edumazet@google.com, kuba@kernel.org,
pabeni@redhat.com
Cc: netdev@vger.kernel.org, linux-kernel@vger.kernel.org,
"Radu Pirea (OSS)" <radu-nicolae.pirea@oss.nxp.com>,
stable@vger.kernel.org
Subject: [PATCH net] net: phy: nxp-c45-tja11xx: fix unsigned long multiplication overflow
Date: Thu, 6 Apr 2023 12:59:53 +0300 [thread overview]
Message-ID: <20230406095953.75622-1-radu-nicolae.pirea@oss.nxp.com> (raw)
Any multiplication between GENMASK(31, 0) and a number bigger than 1
will be truncated because of the overflow, if the size of unsigned long
is 32 bits.
Replaced GENMASK with GENMASK_ULL to make sure that multiplication will
be between 64 bits values.
Cc: <stable@vger.kernel.org> # 5.15+
Fixes: 514def5dd339 ("phy: nxp-c45-tja11xx: add timestamping support")
Signed-off-by: Radu Pirea (OSS) <radu-nicolae.pirea@oss.nxp.com>
---
drivers/net/phy/nxp-c45-tja11xx.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/net/phy/nxp-c45-tja11xx.c b/drivers/net/phy/nxp-c45-tja11xx.c
index 27738d1ae9ea..029875a59ff8 100644
--- a/drivers/net/phy/nxp-c45-tja11xx.c
+++ b/drivers/net/phy/nxp-c45-tja11xx.c
@@ -191,7 +191,7 @@
#define MAX_ID_PS 2260U
#define DEFAULT_ID_PS 2000U
-#define PPM_TO_SUBNS_INC(ppb) div_u64(GENMASK(31, 0) * (ppb) * \
+#define PPM_TO_SUBNS_INC(ppb) div_u64(GENMASK_ULL(31, 0) * (ppb) * \
PTP_CLK_PERIOD_100BT1, NSEC_PER_SEC)
#define NXP_C45_SKB_CB(skb) ((struct nxp_c45_skb_cb *)(skb)->cb)
--
2.34.1
next reply other threads:[~2023-04-06 10:01 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-04-06 9:59 Radu Pirea (OSS) [this message]
2023-04-07 14:24 ` [PATCH net] net: phy: nxp-c45-tja11xx: fix unsigned long multiplication overflow Andrew Lunn
2023-04-08 2:50 ` patchwork-bot+netdevbpf
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