From: Dan Carpenter <dan.carpenter@linaro.org>
To: Yangbo Lu <yangbo.lu@nxp.com>
Cc: Richard Cochran <richardcochran@gmail.com>,
"David S. Miller" <davem@davemloft.net>,
netdev@vger.kernel.org, linux-kernel@vger.kernel.org,
kernel-janitors@vger.kernel.org
Subject: [PATCH net] ptp: fix integer overflow in max_vclocks_store
Date: Fri, 14 Jun 2024 20:31:38 +0300 [thread overview]
Message-ID: <d094ecbe-8b14-45cc-8cd8-f70fdeca55d8@moroto.mountain> (raw)
On 32bit systems, the "4 * max" multiply can overflow. Use size_mul()
to fix this.
Fixes: 44c494c8e30e ("ptp: track available ptp vclocks information")
Signed-off-by: Dan Carpenter <dan.carpenter@linaro.org>
---
drivers/ptp/ptp_sysfs.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/ptp/ptp_sysfs.c b/drivers/ptp/ptp_sysfs.c
index a15460aaa03b..bc1562fcd6c9 100644
--- a/drivers/ptp/ptp_sysfs.c
+++ b/drivers/ptp/ptp_sysfs.c
@@ -296,7 +296,7 @@ static ssize_t max_vclocks_store(struct device *dev,
if (max < ptp->n_vclocks)
goto out;
- size = sizeof(int) * max;
+ size = size_mul(sizeof(int), max);
vclock_index = kzalloc(size, GFP_KERNEL);
if (!vclock_index) {
err = -ENOMEM;
--
2.43.0
next reply other threads:[~2024-06-14 17:31 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-06-14 17:31 Dan Carpenter [this message]
2024-06-15 7:05 ` [PATCH net] ptp: fix integer overflow in max_vclocks_store Christophe JAILLET
2024-06-17 6:01 ` Dan Carpenter
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