CVE-2024-47683

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> drm/amd/display: Skip Recompute DSC Params if no Stream on Link<br /> <br /> [why]<br /> Encounter NULL pointer dereference uner mst + dsc setup.<br /> <br /> BUG: kernel NULL pointer dereference, address: 0000000000000008<br /> PGD 0 P4D 0<br /> Oops: 0000 [#1] PREEMPT SMP NOPTI<br /> CPU: 4 PID: 917 Comm: sway Not tainted 6.3.9-arch1-1 #1 124dc55df4f5272ccb409f39ef4872fc2b3376a2<br /> Hardware name: LENOVO 20NKS01Y00/20NKS01Y00, BIOS R12ET61W(1.31 ) 07/28/2022<br /> RIP: 0010:drm_dp_atomic_find_time_slots+0x5e/0x260 [drm_display_helper]<br /> Code: 01 00 00 48 8b 85 60 05 00 00 48 63 80 88 00 00 00 3b 43 28 0f 8d 2e 01 00 00 48 8b 53 30 48 8d 04 80 48 8d 04 c2 48 8b 40 18 8&gt;<br /> RSP: 0018:ffff960cc2df77d8 EFLAGS: 00010293<br /> RAX: 0000000000000000 RBX: ffff8afb87e81280 RCX: 0000000000000224<br /> RDX: ffff8afb9ee37c00 RSI: ffff8afb8da1a578 RDI: ffff8afb87e81280<br /> RBP: ffff8afb83d67000 R08: 0000000000000001 R09: ffff8afb9652f850<br /> R10: ffff960cc2df7908 R11: 0000000000000002 R12: 0000000000000000<br /> R13: ffff8afb8d7688a0 R14: ffff8afb8da1a578 R15: 0000000000000224<br /> FS: 00007f4dac35ce00(0000) GS:ffff8afe30b00000(0000) knlGS:0000000000000000<br /> CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033<br /> CR2: 0000000000000008 CR3: 000000010ddc6000 CR4: 00000000003506e0<br /> Call Trace:<br /> <br /> ? __die+0x23/0x70<br /> ? page_fault_oops+0x171/0x4e0<br /> ? plist_add+0xbe/0x100<br /> ? exc_page_fault+0x7c/0x180<br /> ? asm_exc_page_fault+0x26/0x30<br /> ? drm_dp_atomic_find_time_slots+0x5e/0x260 [drm_display_helper 0e67723696438d8e02b741593dd50d80b44c2026]<br /> ? drm_dp_atomic_find_time_slots+0x28/0x260 [drm_display_helper 0e67723696438d8e02b741593dd50d80b44c2026]<br /> compute_mst_dsc_configs_for_link+0x2ff/0xa40 [amdgpu 62e600d2a75e9158e1cd0a243bdc8e6da040c054]<br /> ? fill_plane_buffer_attributes+0x419/0x510 [amdgpu 62e600d2a75e9158e1cd0a243bdc8e6da040c054]<br /> compute_mst_dsc_configs_for_state+0x1e1/0x250 [amdgpu 62e600d2a75e9158e1cd0a243bdc8e6da040c054]<br /> amdgpu_dm_atomic_check+0xecd/0x1190 [amdgpu 62e600d2a75e9158e1cd0a243bdc8e6da040c054]<br /> drm_atomic_check_only+0x5c5/0xa40<br /> drm_mode_atomic_ioctl+0x76e/0xbc0<br /> <br /> [how]<br /> dsc recompute should be skipped if no mode change detected on the new<br /> request. If detected, keep checking whether the stream is already on<br /> current state or not.