CVE-2025-68286

In the Linux kernel, the following vulnerability has been resolved:

drm/amd/display: Check NULL before accessing

[WHAT] IGT kmscursorlegacy's long-nonblocking-modeset-vs-cursor-atomic fails with NULL pointer dereference. This can be reproduced with both an eDP panel and a DP monitors connected.

BUG: kernel NULL pointer dereference, address: 0000000000000000 #PF: supervisor read access in kernel mode #PF: errorcode(0x0000) - not-present page PGD 0 P4D 0 Oops: Oops: 0000 [#1] SMP NOPTI CPU: 13 UID: 0 PID: 2960 Comm: kmscursorlega Not tainted 6.16.0-99-custom #8 PREEMPT(voluntary) Hardware name: AMD ........ RIP: 0010:dcstreamgetscanoutpos+0x34/0x130 [amdgpu] Code: 57 4d 89 c7 41 56 49 89 ce 41 55 49 89 d5 41 54 49 89 fc 53 48 83 ec 18 48 8b 87 a0 64 00 00 48 89 75 d0 48 c7 c6 e0 41 30 c2 <48> 8b 38 48 8b 9f 68 06 00 00 e8 8d d7 fd ff 31 c0 48 81 c3 e0 02 RSP: 0018:ffffd0f3c2bd7608 EFLAGS: 00010292 RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffd0f3c2bd7668 RDX: ffffd0f3c2bd7664 RSI: ffffffffc23041e0 RDI: ffff8b32494b8000 RBP: ffffd0f3c2bd7648 R08: ffffd0f3c2bd766c R09: ffffd0f3c2bd7760 R10: ffffd0f3c2bd7820 R11: 0000000000000000 R12: ffff8b32494b8000 R13: ffffd0f3c2bd7664 R14: ffffd0f3c2bd7668 R15: ffffd0f3c2bd766c FS: 000071f631b68700(0000) GS:ffff8b399f114000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000000 CR3: 00000001b8105000 CR4: 0000000000f50ef0 PKRU: 55555554 Call Trace: <TASK> dmcrtcgetscanoutpos+0xd7/0x180 [amdgpu] amdgpudisplaygetcrtc_scanoutpos+0x86/0x1c0 [amdgpu] ? _pfxamdgpucrtcgetscanoutposition+0x10/0x10[amdgpu] amdgpucrtcgetscanoutposition+0x27/0x50 [amdgpu] drmcrtcvblankhelpergetvblanktimestampinternal+0xf7/0x400 drmcrtcvblankhelpergetvblanktimestamp+0x1c/0x30 drmcrtcgetlastvbltimestamp+0x55/0x90 drmcrtcnextvblankstart+0x45/0xa0 drmatomichelperwaitforfences+0x81/0x1f0 ...

(cherry picked from commit 621e55f1919640acab25383362b96e65f2baea3c)