diff options
| author | Alex Deucher <alexander.deucher@amd.com> | 2015-04-17 10:50:02 -0400 |
|---|---|---|
| committer | Alex Deucher <alexander.deucher@amd.com> | 2015-06-03 21:03:16 -0400 |
| commit | 18da4340e651dd41d698fc54084b9139b614539b (patch) | |
| tree | 3113353e0f9706dcfd2d8547b1dcb9304e7ac609 /drivers/gpu/drm/amd/amdgpu/amdgpu_bios.c | |
| parent | 17b10f941f939da459072a066c6e5e9af9dda610 (diff) | |
drm/amdgpu: Do not directly dereference pointers to BIOS area.
Use readb() and memcpy_fromio() accessors instead.
Ported from radeon commit:
f2c9e560b406f2f6b14b345c7da33467dee9cdf2
Acked-by: Christian König <christian.koenig@amd.com>
Acked-by: Jammy Zhou <Jammy.Zhou@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Diffstat (limited to 'drivers/gpu/drm/amd/amdgpu/amdgpu_bios.c')
| -rw-r--r-- | drivers/gpu/drm/amd/amdgpu/amdgpu_bios.c | 10 |
1 files changed, 7 insertions, 3 deletions
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_bios.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_bios.c index d7a3ab2624f0..ceb444f6d418 100644 --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_bios.c +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_bios.c @@ -75,7 +75,7 @@ static bool igp_read_bios_from_vram(struct amdgpu_device *adev) bool amdgpu_read_bios(struct amdgpu_device *adev) { - uint8_t __iomem *bios; + uint8_t __iomem *bios, val1, val2; size_t size; adev->bios = NULL; @@ -85,15 +85,19 @@ bool amdgpu_read_bios(struct amdgpu_device *adev) return false; } - if (size == 0 || bios[0] != 0x55 || bios[1] != 0xaa) { + val1 = readb(&bios[0]); + val2 = readb(&bios[1]); + + if (size == 0 || val1 != 0x55 || val2 != 0xaa) { pci_unmap_rom(adev->pdev, bios); return false; } - adev->bios = kmemdup(bios, size, GFP_KERNEL); + adev->bios = kzalloc(size, GFP_KERNEL); if (adev->bios == NULL) { pci_unmap_rom(adev->pdev, bios); return false; } + memcpy_fromio(adev->bios, bios, size); pci_unmap_rom(adev->pdev, bios); return true; } |