Bug 2307872 (CVE-2024-43899)

Summary: CVE-2024-43899 kernel: drm/amd/display: Fix null pointer deref in dcn20_resource.c
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: low Docs Contact:
Priority: low    
Version: unspecifiedCC: dfreiber, drow, jburrell, vkumar
Target Milestone: ---Keywords: Security
Target Release: ---   
Hardware: All   
OS: Linux   
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Doc Text:
A NULL pointer dereference vulnerability was found in dcn20_get_dcc_compression_cap() function in the dcn20_resource.c file in the AMD GPU driver in the Linux Kernel. This issue could allow an attacker to make the system hang when using the mpv media player with specific hardware acceleration options during fullscreen playback, causing a user application to enter a specific state, for example, transitioning to fullscreen mode in mpv, leading to a denial of service.
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
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Bug Depends On: 2308181    
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Description OSIDB Bzimport 2024-08-26 11:21:11 UTC 
In the Linux kernel, the following vulnerability has been resolved:

drm/amd/display: Fix null pointer deref in dcn20_resource.c

Fixes a hang thats triggered when MPV is run on a DCN401 dGPU:

mpv --hwdec=vaapi --vo=gpu --hwdec-codecs=all

and then enabling fullscreen playback (double click on the video)

The following calltrace will be seen:

[  181.843989] BUG: kernel NULL pointer dereference, address: 0000000000000000
[  181.843997] #PF: supervisor instruction fetch in kernel mode
[  181.844003] #PF: error_code(0x0010) - not-present page
[  181.844009] PGD 0 P4D 0
[  181.844020] Oops: 0010 [#1] PREEMPT SMP NOPTI
[  181.844028] CPU: 6 PID: 1892 Comm: gnome-shell Tainted: G        W  OE      6.5.0-41-generic #41~22.04.2-Ubuntu
[  181.844038] Hardware name: System manufacturer System Product Name/CROSSHAIR VI HERO, BIOS 6302 10/23/2018
[  181.844044] RIP: 0010:0x0
[  181.844079] Code: Unable to access opcode bytes at 0xffffffffffffffd6.
[  181.844084] RSP: 0018:ffffb593c2b8f7b0 EFLAGS: 00010246
[  181.844093] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000004
[  181.844099] RDX: ffffb593c2b8f804 RSI: ffffb593c2b8f7e0 RDI: ffff9e3c8e758400
[  181.844105] RBP: ffffb593c2b8f7b8 R08: ffffb593c2b8f9c8 R09: ffffb593c2b8f96c
[  181.844110] R10: 0000000000000000 R11: 0000000000000000 R12: ffffb593c2b8f9c8
[  181.844115] R13: 0000000000000001 R14: ffff9e3c88000000 R15: 0000000000000005
[  181.844121] FS:  00007c6e323bb5c0(0000) GS:ffff9e3f85f80000(0000) knlGS:0000000000000000
[  181.844128] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  181.844134] CR2: ffffffffffffffd6 CR3: 0000000140fbe000 CR4: 00000000003506e0
[  181.844141] Call Trace:
[  181.844146]  <TASK>
[  181.844153]  ? show_regs+0x6d/0x80
[  181.844167]  ? __die+0x24/0x80
[  181.844179]  ? page_fault_oops+0x99/0x1b0
[  181.844192]  ? do_user_addr_fault+0x31d/0x6b0
[  181.844204]  ? exc_page_fault+0x83/0x1b0
[  181.844216]  ? asm_exc_page_fault+0x27/0x30
[  181.844237]  dcn20_get_dcc_compression_cap+0x23/0x30 [amdgpu]
[  181.845115]  amdgpu_dm_plane_validate_dcc.constprop.0+0xe5/0x180 [amdgpu]
[  181.845985]  amdgpu_dm_plane_fill_plane_buffer_attributes+0x300/0x580 [amdgpu]
[  181.846848]  fill_dc_plane_info_and_addr+0x258/0x350 [amdgpu]
[  181.847734]  fill_dc_plane_attributes+0x162/0x350 [amdgpu]
[  181.848748]  dm_update_plane_state.constprop.0+0x4e3/0x6b0 [amdgpu]
[  181.849791]  ? dm_update_plane_state.constprop.0+0x4e3/0x6b0 [amdgpu]
[  181.850840]  amdgpu_dm_atomic_check+0xdfe/0x1760 [amdgpu]
Comment 1 Mauro Matteo Cascella 2024-08-27 15:05:23 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2024082614-CVE-2024-43899-2339@gregkh/T