linux-kernel - [PATCH -next] genirq/msi: Use kmemdup_array() instead of kmemdup() for multiple allocation

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Message-ID: <20240828072219.1249250-1-ruanjinjie@huawei.com>
Date: Wed, 28 Aug 2024 15:22:19 +0800
From: Jinjie Ruan <ruanjinjie@...wei.com>
To: <tglx@...utronix.de>, <linux-kernel@...r.kernel.org>
CC: <ruanjinjie@...wei.com>
Subject: [PATCH -next] genirq/msi: Use kmemdup_array() instead of kmemdup() for multiple allocation

Let kmemdup_array() take care about multiplication and possible
overflows.

Signed-off-by: Jinjie Ruan <ruanjinjie@...wei.com>
---
 kernel/irq/msi.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/irq/msi.c b/kernel/irq/msi.c
index ca6e2ae6d6fc..3a24d6b5f559 100644
--- a/kernel/irq/msi.c
+++ b/kernel/irq/msi.c
@@ -82,7 +82,7 @@ static struct msi_desc *msi_alloc_desc(struct device *dev, int nvec,
 	desc->dev = dev;
 	desc->nvec_used = nvec;
 	if (affinity) {
-		desc->affinity = kmemdup(affinity, nvec * sizeof(*desc->affinity), GFP_KERNEL);
+		desc->affinity = kmemdup_array(affinity, nvec, sizeof(*desc->affinity), GFP_KERNEL);
 		if (!desc->affinity) {
 			kfree(desc);
 			return NULL;
-- 
2.34.1