6.5.5: UBSAN: radeon_atombios.c: index 1 is out of range for type 'UCHAR [1]'

[Jeff Johnson]

On 10/1/23 17:12, Justin Piszcz wrote:
>>> ================================================================================
>>> [Sun Oct  1 15:59:04 2023] UBSAN: array-index-out-of-bounds in
>>> drivers/gpu/drm/radeon/radeon_atombios.c:2620:43
>>> [Sun Oct  1 15:59:04 2023] index 1 is out of range for type 'UCHAR [1]'
>>> [Sun Oct  1 15:59:04 2023] CPU: 5 PID: 1 Comm: swapper/0 Tainted: G
>>>              T  6.5.5 #13 55df8de52754ef95effc50a55e9206abdea304ac
>>> [Sun Oct  1 15:59:04 2023] Hardware name: Supermicro X9SRL-F/X9SRL-F,
>>> BIOS 3.3 11/13/2018
>>> [Sun Oct  1 15:59:04 2023] Call Trace:
>>> [Sun Oct  1 15:59:04 2023]  <TASK>
>>> [Sun Oct  1 15:59:04 2023]  dump_stack_lvl+0x36/0x50
>>> [Sun Oct  1 15:59:04 2023]  __ubsan_handle_out_of_bounds+0xc7/0x110
>>> [Sun Oct  1 15:59:04 2023]  radeon_atombios_get_power_modes+0x87a/0x8f0
>>> [Sun Oct  1 15:59:04 2023]  radeon_pm_init+0x13a/0x7e0
>>> [Sun Oct  1 15:59:04 2023]  evergreen_init+0x13d/0x3d0
>>> [Sun Oct  1 15:59:04 2023]  radeon_device_init+0x60a/0xbf0
>>> [Sun Oct  1 15:59:04 2023]  radeon_driver_load_kms+0xb1/0x250
>>> [Sun Oct  1 15:59:04 2023]  drm_dev_register+0xfc/0x250
>>> [Sun Oct  1 15:59:04 2023]  radeon_pci_probe+0xd0/0x150
>>> [Sun Oct  1 15:59:04 2023]  pci_device_probe+0x97/0x130
>>> [Sun Oct  1 15:59:04 2023]  really_probe+0xbe/0x2f0
>>> [Sun Oct  1 15:59:04 2023]  ? __pfx___driver_attach+0x10/0x10
>>> [Sun Oct  1 15:59:04 2023]  __driver_probe_device+0x6e/0x120
>>> [Sun Oct  1 15:59:04 2023]  driver_probe_device+0x1a/0x90
>>> [Sun Oct  1 15:59:04 2023]  __driver_attach+0xd4/0x170
>>> [Sun Oct  1 15:59:04 2023]  bus_for_each_dev+0x87/0xe0
>>> [Sun Oct  1 15:59:04 2023]  bus_add_driver+0xf3/0x1f0
>>> [Sun Oct  1 15:59:04 2023]  driver_register+0x58/0x120
>>> [Sun Oct  1 15:59:04 2023]  ? __pfx_radeon_module_init+0x10/0x10
>>> [Sun Oct  1 15:59:04 2023]  do_one_initcall+0x93/0x4a0
>>> [Sun Oct  1 15:59:04 2023]  kernel_init_freeable+0x301/0x580
>>> [Sun Oct  1 15:59:04 2023]  ? __pfx_kernel_init+0x10/0x10
>>> [Sun Oct  1 15:59:04 2023]  kernel_init+0x15/0x1b0
>>> [Sun Oct  1 15:59:04 2023]  ret_from_fork+0x2f/0x50
>>> [Sun Oct  1 15:59:04 2023]  ? __pfx_kernel_init+0x10/0x10
>>> [Sun Oct  1 15:59:04 2023]  ret_from_fork_asm+0x1b/0x30
>>> [Sun Oct  1 15:59:04 2023]  </TASK>
>>> [Sun Oct  1 15:59:04 2023]
>>> ================================================================================
>>> [Sun Oct  1 15:59:04 2023] [drm] radeon: dpm initialized
>>> [Sun Oct  1 15:59:04 2023] [drm] GART: num cpu pages 262144, num gpu
>>> pages 262144
>>> [Sun Oct  1 15:59:04 2023] [drm] enabling PCIE gen 2 link speeds,
>>> disable with radeon.pcie_gen2=0
>>> [Sun Oct  1 15:59:04 2023] [drm] PCIE GART of 1024M enabled (table at
>>> 0x000000000014C000).
>>> [Sun Oct  1 15:59:04 2023] radeon 0000:03:00.0: WB enabled
>>> [Sun Oct  1 15:59:04 2023] radeon 0000:03:00.0: fence driver on ring 0
>>> use gpu addr 0x0000000040000c00
>>> [Sun Oct  1 15:59:04 2023] radeon 0000:03:00.0: fence driver on ring 3
>>> use gpu addr 0x0000000040000c0c
>>> [Sun Oct  1 15:59:04 2023] radeon 0000:03:00.0: fence driver on ring 5
>>> use gpu addr 0x000000000005c418
>>> [Sun Oct  1 15:59:04 2023] radeon 0000:03:00.0: radeon: MSI limited to 32-bit
>>> [Sun Oct  1 15:59:04 2023] radeon 0000:03:00.0: radeon: using MSI.
>>> [Sun Oct  1 15:59:04 2023] [drm] radeon: irq initialized.
>>>
>>
>> Please also open an issue on freedesktop tracker [1].
>>
>> Thanks.
>>
>> [1]: https://gitlab.freedesktop.org/drm/amd/-/issues
> 
> Issue opened: https://gitlab.freedesktop.org/drm/amd/-/issues/2894
> 
> Regards,
> Justin

+Kees since I've worked with him on several of these flexible array issues.

I just happened to look at kernel logs today for my ath1*k driver 
maintenance and see the subject issue is present on my device, running 
6.9.0-rc1. The freedesktop issue tracker says the issue is closed, but 
any fix has not landed in the upstream kernel. Is there a -next patch 
somewhere?

[   12.105270] UBSAN: array-index-out-of-bounds in 
drivers/gpu/drm/radeon/radeon_atombios.c:2718:34
[   12.105272] index 48 is out of range for type 'UCHAR [1]'
[

If there isn't really an upstream fix, I can probably supply one.

/jeff