linux-kernel - [PATCH] vfio/pci: clean up a type in vfio_pci_ioctl_pci_hot_reset

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Message-ID: <262ada03-d848-4369-9c37-81edeeed2da2@stanley.mountain>
Date: Thu, 12 Sep 2024 11:49:10 +0300
From: Dan Carpenter <dan.carpenter@...aro.org>
To: Alex Williamson <alex.williamson@...hat.com>
Cc: Jason Gunthorpe <jgg@...pe.ca>, Kevin Tian <kevin.tian@...el.com>,
	Yi Liu <yi.l.liu@...el.com>, Christian Brauner <brauner@...nel.org>,
	Kunwu Chan <chentao@...inos.cn>, Ankit Agrawal <ankita@...dia.com>,
	kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
	kernel-janitors@...r.kernel.org
Subject: [PATCH] vfio/pci: clean up a type in
 vfio_pci_ioctl_pci_hot_reset_groups()

The "array_count" value comes from the copy_from_user() in
vfio_pci_ioctl_pci_hot_reset().  If the user passes a value larger than
INT_MAX then we'll pass a negative value to kcalloc() which triggers an
allocation failure and a stack trace.

It's better to make the type unsigned so that if (array_count > count)
returns -EINVAL instead.

Signed-off-by: Dan Carpenter <dan.carpenter@...aro.org>
---
 drivers/vfio/pci/vfio_pci_core.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/vfio/pci/vfio_pci_core.c b/drivers/vfio/pci/vfio_pci_core.c
index 077d4a2629c8..1ab58da9f38a 100644
--- a/drivers/vfio/pci/vfio_pci_core.c
+++ b/drivers/vfio/pci/vfio_pci_core.c
@@ -1324,7 +1324,7 @@ static int vfio_pci_ioctl_get_pci_hot_reset_info(
 
 static int
 vfio_pci_ioctl_pci_hot_reset_groups(struct vfio_pci_core_device *vdev,
-				    int array_count, bool slot,
+				    u32 array_count, bool slot,
 				    struct vfio_pci_hot_reset __user *arg)
 {
 	int32_t *group_fds;
-- 
2.45.2