Acked-by: Diana Craciun <diana.craciun@xxxxxxxxxxx> On 10/23/2020 2:34 PM, Dan Carpenter wrote:
The copy_to_user() function returns the number of bytes remaining to be copied, but this code should return -EFAULT. Fixes: df747bcd5b21 ("vfio/fsl-mc: Implement VFIO_DEVICE_GET_REGION_INFO ioctl call") Signed-off-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx> --- drivers/vfio/fsl-mc/vfio_fsl_mc.c | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-) diff --git a/drivers/vfio/fsl-mc/vfio_fsl_mc.c b/drivers/vfio/fsl-mc/vfio_fsl_mc.c index 0113a980f974..21f22e3da11f 100644 --- a/drivers/vfio/fsl-mc/vfio_fsl_mc.c +++ b/drivers/vfio/fsl-mc/vfio_fsl_mc.c @@ -248,7 +248,9 @@ static long vfio_fsl_mc_ioctl(void *device_data, unsigned int cmd, info.size = vdev->regions[info.index].size; info.flags = vdev->regions[info.index].flags;- return copy_to_user((void __user *)arg, &info, minsz);+ if (copy_to_user((void __user *)arg, &info, minsz)) + return -EFAULT; + return 0; } case VFIO_DEVICE_GET_IRQ_INFO: { @@ -267,7 +269,9 @@ static long vfio_fsl_mc_ioctl(void *device_data, unsigned int cmd, info.flags = VFIO_IRQ_INFO_EVENTFD; info.count = 1;- return copy_to_user((void __user *)arg, &info, minsz);+ if (copy_to_user((void __user *)arg, &info, minsz)) + return -EFAULT; + return 0; } case VFIO_DEVICE_SET_IRQS: {
