Commit edfd6572 authored by David Miller's avatar David Miller Committed by Greg Kroah-Hartman

radeon: Do not directly dereference pointers to BIOS area.

commit f2c9e560 upstream.

Use readb() and memcpy_fromio() accessors instead.
Reviewed-by: default avatarChristian König <christian.koenig@amd.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
Signed-off-by: default avatarAlex Deucher <alexander.deucher@amd.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 19b6da5a
......@@ -76,7 +76,7 @@ static bool igp_read_bios_from_vram(struct radeon_device *rdev)
static bool radeon_read_bios(struct radeon_device *rdev)
{
uint8_t __iomem *bios;
uint8_t __iomem *bios, val1, val2;
size_t size;
rdev->bios = NULL;
......@@ -86,15 +86,19 @@ static bool radeon_read_bios(struct radeon_device *rdev)
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(rdev->pdev, bios);
return false;
}
rdev->bios = kmemdup(bios, size, GFP_KERNEL);
rdev->bios = kzalloc(size, GFP_KERNEL);
if (rdev->bios == NULL) {
pci_unmap_rom(rdev->pdev, bios);
return false;
}
memcpy_fromio(rdev->bios, bios, size);
pci_unmap_rom(rdev->pdev, bios);
return true;
}
......
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