drm/amdgpu: Validate VM ioctl flags.

From Bas Nieuwenhuizen
9d0b2afadfd71e9bedd593358bd7ac4701e46477 in linux-6.1.y/6.1.38
a2b308044dcaca8d3e580959a4f867a1d5c37fac in mainline linux

diff --git a/sys/dev/pci/drm/amd/amdgpu/amdgpu_vm.c b/sys/dev/pci/drm/amd/amdgpu/amdgpu_vm.c
index a1c8f2d..d3a369f 100644 (file)
--- a/sys/dev/pci/drm/amd/amdgpu/amdgpu_vm.c
+++ b/sys/dev/pci/drm/amd/amdgpu/amdgpu_vm.c
@@ -2436,6 +2436,10 @@ int amdgpu_vm_ioctl(struct drm_device *dev, void *data, struct drm_file *filp)
        long timeout = msecs_to_jiffies(2000);
        int r;
 
+       /* No valid flags defined yet */
+       if (args->in.flags)
+               return -EINVAL;
+
        switch (args->in.op) {
        case AMDGPU_VM_OP_RESERVE_VMID:
                /* We only have requirement to reserve vmid from gfxhub */