[Bug 214847] [radeon] UBSAN shows several null-ptr-deref in drm/radeon/atom.c, radeon_atombios.c, atombios_encoders.c, atombios_crtc.c

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https://bugzilla.kernel.org/show_bug.cgi?id=214847

--- Comment #2 from Erhard F. (erhard_f@xxxxxxxxxxx) ---
 # lspci 
00:00.0 Host bridge: Advanced Micro Devices, Inc. [AMD] Starship/Matisse Root
Complex
00:00.2 IOMMU: Advanced Micro Devices, Inc. [AMD] Starship/Matisse IOMMU
00:01.0 Host bridge: Advanced Micro Devices, Inc. [AMD] Starship/Matisse PCIe
Dummy Host Bridge
00:01.1 PCI bridge: Advanced Micro Devices, Inc. [AMD] Starship/Matisse GPP
Bridge
00:01.3 PCI bridge: Advanced Micro Devices, Inc. [AMD] Starship/Matisse GPP
Bridge
00:02.0 Host bridge: Advanced Micro Devices, Inc. [AMD] Starship/Matisse PCIe
Dummy Host Bridge
00:03.0 Host bridge: Advanced Micro Devices, Inc. [AMD] Starship/Matisse PCIe
Dummy Host Bridge
00:03.1 PCI bridge: Advanced Micro Devices, Inc. [AMD] Starship/Matisse GPP
Bridge
00:04.0 Host bridge: Advanced Micro Devices, Inc. [AMD] Starship/Matisse PCIe
Dummy Host Bridge
00:05.0 Host bridge: Advanced Micro Devices, Inc. [AMD] Starship/Matisse PCIe
Dummy Host Bridge
00:07.0 Host bridge: Advanced Micro Devices, Inc. [AMD] Starship/Matisse PCIe
Dummy Host Bridge
00:07.1 PCI bridge: Advanced Micro Devices, Inc. [AMD] Starship/Matisse
Internal PCIe GPP Bridge 0 to bus[E:B]
00:08.0 Host bridge: Advanced Micro Devices, Inc. [AMD] Starship/Matisse PCIe
Dummy Host Bridge
00:08.1 PCI bridge: Advanced Micro Devices, Inc. [AMD] Starship/Matisse
Internal PCIe GPP Bridge 0 to bus[E:B]
00:14.0 SMBus: Advanced Micro Devices, Inc. [AMD] FCH SMBus Controller (rev 61)
00:14.3 ISA bridge: Advanced Micro Devices, Inc. [AMD] FCH LPC Bridge (rev 51)
00:18.0 Host bridge: Advanced Micro Devices, Inc. [AMD] Matisse Device 24:
Function 0
00:18.1 Host bridge: Advanced Micro Devices, Inc. [AMD] Matisse Device 24:
Function 1
00:18.2 Host bridge: Advanced Micro Devices, Inc. [AMD] Matisse Device 24:
Function 2
00:18.3 Host bridge: Advanced Micro Devices, Inc. [AMD] Matisse Device 24:
Function 3
00:18.4 Host bridge: Advanced Micro Devices, Inc. [AMD] Matisse Device 24:
Function 4
00:18.5 Host bridge: Advanced Micro Devices, Inc. [AMD] Matisse Device 24:
Function 5
00:18.6 Host bridge: Advanced Micro Devices, Inc. [AMD] Matisse Device 24:
Function 6
00:18.7 Host bridge: Advanced Micro Devices, Inc. [AMD] Matisse Device 24:
Function 7
01:00.0 Non-Volatile memory controller: Sandisk Corp WD Blue SN550 NVMe SSD
(rev 01)
02:00.0 USB controller: Advanced Micro Devices, Inc. [AMD] 400 Series Chipset
USB 3.1 XHCI Controller (rev 01)
02:00.1 SATA controller: Advanced Micro Devices, Inc. [AMD] 400 Series Chipset
SATA Controller (rev 01)
02:00.2 PCI bridge: Advanced Micro Devices, Inc. [AMD] 400 Series Chipset PCIe
Bridge (rev 01)
03:00.0 PCI bridge: Advanced Micro Devices, Inc. [AMD] 400 Series Chipset PCIe
Port (rev 01)
03:01.0 PCI bridge: Advanced Micro Devices, Inc. [AMD] 400 Series Chipset PCIe
Port (rev 01)
03:04.0 PCI bridge: Advanced Micro Devices, Inc. [AMD] 400 Series Chipset PCIe
Port (rev 01)
05:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8111/8168/8411
PCI Express Gigabit Ethernet Controller (rev 15)
07:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] RV516
[Radeon X1300/X1550 Series]
07:00.1 Display controller: Advanced Micro Devices, Inc. [AMD/ATI] RV516
[Radeon X1300/X1550 Series] (Secondary)
08:00.0 Non-Essential Instrumentation [1300]: Advanced Micro Devices, Inc.
[AMD] Starship/Matisse PCIe Dummy Function
09:00.0 Non-Essential Instrumentation [1300]: Advanced Micro Devices, Inc.
[AMD] Starship/Matisse Reserved SPP
09:00.1 Encryption controller: Advanced Micro Devices, Inc. [AMD]
Starship/Matisse Cryptographic Coprocessor PSPCPP
09:00.3 USB controller: Advanced Micro Devices, Inc. [AMD] Matisse USB 3.0 Host
Controller


 # lspci -vv -s 07:00.0
07:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] RV516
[Radeon X1300/X1550 Series] (prog-if 00 [VGA controller])
        Subsystem: PC Partner Limited / Sapphire Technology RV516 [Radeon
X1300/X1550 Series]
        Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr-
Stepping- SERR- FastB2B- DisINTx-
        Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort-
<MAbort- >SERR- <PERR- INTx-
        Latency: 0, Cache Line Size: 64 bytes
        Interrupt: pin A routed to IRQ 57
        IOMMU group: 2
        Region 0: Memory at e0000000 (64-bit, prefetchable) [size=256M]
        Region 2: Memory at fce30000 (64-bit, non-prefetchable) [size=64K]
        Region 4: I/O ports at e000 [size=256]
        Expansion ROM at 000c0000 [disabled] [size=128K]
        Capabilities: [50] Power Management version 2
                Flags: PMEClk- DSI- D1+ D2+ AuxCurrent=0mA
PME(D0-,D1-,D2-,D3hot-,D3cold-)
                Status: D0 NoSoftRst- PME-Enable- DSel=0 DScale=0 PME-
        Capabilities: [58] Express (v1) Endpoint, MSI 00
                DevCap: MaxPayload 128 bytes, PhantFunc 0, Latency L0s <4us, L1
unlimited
                        ExtTag+ AttnBtn- AttnInd- PwrInd- RBE- FLReset-
SlotPowerLimit 75.000W
                DevCtl: CorrErr- NonFatalErr- FatalErr- UnsupReq-
                        RlxdOrd+ ExtTag+ PhantFunc- AuxPwr- NoSnoop+
                        MaxPayload 128 bytes, MaxReadReq 128 bytes
                DevSta: CorrErr- NonFatalErr- FatalErr- UnsupReq- AuxPwr-
TransPend-
                LnkCap: Port #0, Speed 2.5GT/s, Width x16, ASPM L0s L1, Exit
Latency L0s <64ns, L1 <1us
                        ClockPM- Surprise- LLActRep- BwNot- ASPMOptComp-
                LnkCtl: ASPM Disabled; RCB 64 bytes, Disabled- CommClk+
                        ExtSynch- ClockPM- AutWidDis- BWInt- AutBWInt-
                LnkSta: Speed 2.5GT/s (ok), Width x16 (ok)
                        TrErr- Train- SlotClk+ DLActive- BWMgmt- ABWMgmt-
        Capabilities: [80] MSI: Enable- Count=1/1 Maskable- 64bit+
                Address: 0000000000000000  Data: 0000
        Kernel driver in use: radeon
        Kernel modules: radeon

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