diff options
| author | Mario Limonciello <[email protected]> | 2024-10-11 17:23:15 +0000 |
|---|---|---|
| committer | Alex Deucher <[email protected]> | 2024-10-22 21:22:44 +0000 |
| commit | c9b7c809b89f24e9372a4e7f02d64c950b07fdee (patch) | |
| tree | 3437fdbebdc7c5e9f746c797990f991f22c84ad1 /drivers/gpu/drm/amd/amdgpu/amdgpu_discovery.c | |
| parent | drm/amdgpu/swsmu: add automatic parameter to set_soft_freq_range (diff) | |
| download | kernel-c9b7c809b89f24e9372a4e7f02d64c950b07fdee.tar.gz kernel-c9b7c809b89f24e9372a4e7f02d64c950b07fdee.zip | |
drm/amd: Guard against bad data for ATIF ACPI method
If a BIOS provides bad data in response to an ATIF method call
this causes a NULL pointer dereference in the caller.
```
? show_regs (arch/x86/kernel/dumpstack.c:478 (discriminator 1))
? __die (arch/x86/kernel/dumpstack.c:423 arch/x86/kernel/dumpstack.c:434)
? page_fault_oops (arch/x86/mm/fault.c:544 (discriminator 2) arch/x86/mm/fault.c:705 (discriminator 2))
? do_user_addr_fault (arch/x86/mm/fault.c:440 (discriminator 1) arch/x86/mm/fault.c:1232 (discriminator 1))
? acpi_ut_update_object_reference (drivers/acpi/acpica/utdelete.c:642)
? exc_page_fault (arch/x86/mm/fault.c:1542)
? asm_exc_page_fault (./arch/x86/include/asm/idtentry.h:623)
? amdgpu_atif_query_backlight_caps.constprop.0 (drivers/gpu/drm/amd/amdgpu/amdgpu_acpi.c:387 (discriminator 2)) amdgpu
? amdgpu_atif_query_backlight_caps.constprop.0 (drivers/gpu/drm/amd/amdgpu/amdgpu_acpi.c:386 (discriminator 1)) amdgpu
```
It has been encountered on at least one system, so guard for it.
Fixes: d38ceaf99ed0 ("drm/amdgpu: add core driver (v4)")
Acked-by: Alex Deucher <[email protected]>
Signed-off-by: Mario Limonciello <[email protected]>
Signed-off-by: Alex Deucher <[email protected]>
Diffstat (limited to 'drivers/gpu/drm/amd/amdgpu/amdgpu_discovery.c')
0 files changed, 0 insertions, 0 deletions