linux-kernel - [PATCH 2/2] um: use uml_kmalloc_array() instead of uml

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Message-ID: <20260120112938.463596-2-iamhswang@gmail.com>
Date: Tue, 20 Jan 2026 19:28:55 +0800
From: iamhswang@...il.com
To: richard@....at,
	anton.ivanov@...bridgegreys.com,
	johannes@...solutions.net,
	akpm@...ux-foundation.org,
	dave.hansen@...ux.intel.com,
	tiwei.btw@...group.com,
	rppt@...nel.org,
	kevin.brodsky@....com,
	snovitoll@...il.com,
	linux@...ssschuh.net
Cc: linux-um@...ts.infradead.org,
	linux-kernel@...r.kernel.org,
	iamhswang@...il.com
Subject: [PATCH 2/2] um: use uml_kmalloc_array() instead of uml_malloc()

From: Haisu Wang <iamhswang@...il.com>

Replace uml_kmalloc() with uml_kmalloc_array() for multiplication.

Signed-off-by: Haisu Wang <wanghs18@...natelecom.cn>
---
 arch/um/drivers/vector_user.c | 4 ++--
 arch/um/drivers/vfio_user.c   | 4 ++--
 2 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/arch/um/drivers/vector_user.c b/arch/um/drivers/vector_user.c
index 2ea67e6fd067..adc4280691cf 100644
--- a/arch/um/drivers/vector_user.c
+++ b/arch/um/drivers/vector_user.c
@@ -868,8 +868,8 @@ void *uml_vector_default_bpf(const void *mac)
 	} else {
 		return NULL;
 	}
-	bpf = uml_kmalloc(
-		sizeof(struct sock_filter) * DEFAULT_BPF_LEN, UM_GFP_KERNEL);
+	bpf = uml_kmalloc_array(DEFAULT_BPF_LEN, sizeof(struct sock_filter),
+			UM_GFP_KERNEL);
 	if (bpf) {
 		bpf_prog->filter = bpf;
 		/* ld	[8] */
diff --git a/arch/um/drivers/vfio_user.c b/arch/um/drivers/vfio_user.c
index 6a45d8e14582..4ad8c8c59e9d 100644
--- a/arch/um/drivers/vfio_user.c
+++ b/arch/um/drivers/vfio_user.c
@@ -194,7 +194,7 @@ int uml_vfio_user_setup_device(struct uml_vfio_user_device *dev,
 	if (dev->num_regions > VFIO_PCI_CONFIG_REGION_INDEX + 1)
 		dev->num_regions = VFIO_PCI_CONFIG_REGION_INDEX + 1;
 
-	dev->region = uml_kmalloc(sizeof(*dev->region) * dev->num_regions,
+	dev->region = uml_kmalloc_array(dev->num_regions, sizeof(*dev->region),
 				  UM_GFP_KERNEL);
 	if (!dev->region) {
 		err = -ENOMEM;
@@ -223,7 +223,7 @@ int uml_vfio_user_setup_device(struct uml_vfio_user_device *dev,
 
 	dev->irq_count = irq_info.count;
 
-	dev->irqfd = uml_kmalloc(sizeof(int) * dev->irq_count, UM_GFP_KERNEL);
+	dev->irqfd = uml_kmalloc_array(dev->irq_count, sizeof(int), UM_GFP_KERNEL);
 	if (!dev->irqfd) {
 		err = -ENOMEM;
 		goto free_region;
-- 
2.52.0