# CVE-2024-43901: drm/amd/display: Fix NULL pointer dereference for DTN log in DCN401

CVE-2024-43901 is fixed in linux on 1 platform, first by DEBIAN-CVE-2024-43901, released August 26, 2024. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2024-43901
- Priority: Routine
- CVSS: 5.5 (medium)
- EPSS: 0.0018
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Aug 26, 2024
- Weakness: NULL Pointer Dereference
- Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2024-43901

## Description

In the Linux kernel, the following vulnerability has been resolved:  drm/amd/display: Fix NULL pointer dereference for DTN log in DCN401  When users run the command:  cat /sys/kernel/debug/dri/0/amdgpu_dm_dtn_log  The following NULL pointer dereference happens:  [  +0.000003] BUG: kernel NULL pointer dereference, address: NULL [  +0.000005] #PF: supervisor instruction fetch in kernel mode [  +0.000002] #PF: error_code(0x0010) - not-present page [  +0.000002] PGD 0 P4D 0 [  +0.000004] Oops: 0010 [#1] PREEMPT SMP NOPTI [  +0.000003] RIP: 0010:0x0 [  +0.000008] Code: Unable to access opcode bytes at 0xffffffffffffffd6. [...] [  +0.000002] PKRU: 55555554 [  +0.000002] Call Trace: [  +0.000002]  <TASK> [  +0.000003]  ? show_regs+0x65/0x70 [  +0.000006]  ? __die+0x24/0x70 [  +0.000004]  ? page_fault_oops+0x160/0x470 [  +0.000006]  ? do_user_addr_fault+0x2b5/0x690 [  +0.000003]  ? prb_read_valid+0x1c/0x30 [  +0.000005]  ? exc_page_fault+0x8c/0x1a0 [  +0.000005]  ? asm_exc_page_fault+0x27/0x30 [  +0.000012]  dcn10_log_color_state+0xf9/0x510 [amdgpu] [  +0.000306]  ? srso_alias_return_thunk+0x5/0xfbef5 [  +0.000003]  ? vsnprintf+0x2fb/0x600 [  +0.000009]  dcn10_log_hw_state+0xfd0/0xfe0 [amdgpu] [  +0.000218]  ? __mod_memcg_lruvec_state+0xe8/0x170 [  +0.000008]  ? srso_alias_return_thunk+0x5/0xfbef5 [  +0.000002]  ? debug_smp_processor_id+0x17/0x20 [  +0.000003]  ? srso_alias_return_thunk+0x5/0xfbef5 [  +0.000002]  ? srso_alias_return_thunk+0x5/0xfbef5 [  +0.000002]  ? set_ptes.isra.0+0x2b/0x90 [  +0.000004]  ? srso_alias_return_thunk+0x5/0xfbef5 [  +0.000002]  ? _raw_spin_unlock+0x19/0x40 [  +0.000004]  ? srso_alias_return_thunk+0x5/0xfbef5 [  +0.000002]  ? do_anonymous_page+0x337/0x700 [  +0.000004]  dtn_log_read+0x82/0x120 [amdgpu] [  +0.000207]  full_proxy_read+0x66/0x90 [  +0.000007]  vfs_read+0xb0/0x340 [  +0.000005]  ? __count_memcg_events+0x79/0xe0 [  +0.000002]  ? srso_alias_return_thunk+0x5/0xfbef5 [  +0.000003]  ? count_memcg_events.constprop.0+0x1e/0x40 [  +0.000003]  ? handle_mm_fault+0xb2/0x370 [  +0.000003]  ksys_read+0x6b/0xf0 [  +0.000004]  __x64_sys_read+0x19/0x20 [  +0.000003]  do_syscall_64+0x60/0x130 [  +0.000004]  entry_SYSCALL_64_after_hwframe+0x6e/0x76 [  +0.000003] RIP: 0033:0x7fdf32f147e2 [...]  This error happens when the color log tries to read the gamut remap information from DCN401 which is not initialized in the dcn401_dpp_funcs which leads to a null pointer dereference. This commit addresses this issue by adding a proper guard to access the gamut_remap callback in case the specific ASIC did not implement this function.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 13.5 (trixie) | 6.10.6-1 | [DEBIAN-CVE-2024-43901](https://patchblox.com/security/data/fix/linux/debian-cve-2024-43901.md) | Aug 26, 2024 |
| Linux | linux Debian 14 | 6.10.6-1 | [DEBIAN-CVE-2024-43901](https://patchblox.com/security/data/fix/linux/debian-cve-2024-43901.md) | Aug 26, 2024 |

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