CVE-2024-57919

/// Technical description

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

drm/amd/display: fix divide error in DM plane scale calcs

dm_get_plane_scale doesn't take into account plane scaled size equal to

zero, leading to a kernel oops due to division by zero. Fix by setting

out-scale size as zero when the dst size is zero, similar to what is

done by drm_calc_scale(). This issue started with the introduction of

cursor ovelay mode that uses this function to assess cursor mode changes

via dm_crtc_get_cursor_mode() before checking plane state.

[Dec17 17:14] Oops: divide error: 0000 [#1] PREEMPT SMP NOPTI

[ +0.000018] CPU: 5 PID: 1660 Comm: surface-DP-1 Not tainted 6.10.0+ #231

[ +0.000007] Hardware name: Valve Jupiter/Jupiter, BIOS F7A0131 01/30/2024

[ +0.000004] RIP: 0010:dm_get_plane_scale+0x3f/0x60 [amdgpu]

[ +0.000553] Code: 44 0f b7 41 3a 44 0f b7 49 3e 83 e0 0f 48 0f a3 c2 73 21 69 41 28 e8 03 00 00 31 d2 41 f7 f1 31 d2 89 06 69 41 2c e8 03 00 00 <41> f7 f0 89 07 e9 d7 d8 7e e9 44 8

/// Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

/// References