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Drivers: hv: vmbus: Check ACPI companion before use

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Platform drivers can be forced to bind to devices outside their match
tables through driver_override. vmbus_acpi_add() assumes that every bound
device has an ACPI companion and dereferences it without checking.

Return -ENODEV when the companion is absent to avoid a NULL pointer
dereference.

Signed-off-by: Jiale Yao <yaojiale02@163.com>
Fixes: 9c84342380 ("Drivers: hv: vmbus: Convert acpi_device to more generic platform_device")
Reviewed-by: Naman Jain <namjain@linux.microsoft.com>
Signed-off-by: Wei Liu <wei.liu@kernel.org>
This commit is contained in:
Jiale Yao 2026-10-17 14:43:13 +08:00 committed by Wei Liu
parent 6eb81a2a06
commit dd57772e36
1 changed files with 6 additions and 2 deletions
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8
drivers/hv/vmbus_drv.c
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@ -2571,10 +2571,14 @@ EXPORT_SYMBOL_GPL(vmbus_free_mmio);
#ifdef CONFIG_ACPI
static int vmbus_acpi_add(struct platform_device *pdev)
{
struct acpi_device *ancestor;
struct acpi_device *device;
acpi_status result;
int ret_val = -ENODEV;
struct acpi_device *ancestor;
struct acpi_device *device = ACPI_COMPANION(&pdev->dev);
device = ACPI_COMPANION(&pdev->dev);
if (!device)
return -ENODEV;
vmbus_root_device = &device->dev;