On Fri, Aug 16, 2019 at 10:25:56AM +0800, Zhao Yakui wrote:
> diff --git a/drivers/staging/acrn/acrn_dev.c b/drivers/staging/acrn/acrn_dev.c
> index 0602125..6868003 100644
> --- a/drivers/staging/acrn/acrn_dev.c
> +++ b/drivers/staging/acrn/acrn_dev.c
> @@ -588,6 +588,41 @@ static const struct file_operations fops = {
> #define SUPPORT_HV_API_VERSION_MAJOR 1
> #define SUPPORT_HV_API_VERSION_MINOR 0
>
> +static ssize_t
> +offline_cpu_store(struct device *dev,
> + struct device_attribute *attr,
> + const char *buf, size_t count)
> +{
> +#ifdef CONFIG_X86
> + u64 cpu, lapicid;
> +
> + if (kstrtoull(buf, 0, &cpu) < 0)
> + return -EINVAL;
Preserve the error code.
ret = kstrtoull(buf, 0, &cpu);
if (ret)
return ret;
> +
> + if (cpu_possible(cpu)) {
You can't pass unchecked cpu values to cpu_possible() or it results in
an out of bounds read if cpu is >= than nr_cpu_ids.
regards,
dan carpenter
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