drm/amd/display: check dc_state_create_copy() for NULL in dm_suspend

Overview

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

drm/amd/display: check dc_state_create_copy() for NULL in dm_suspend

dc_state_create_copy() can return NULL on allocation failure. dm_suspend() only conditionally skips dm_gpureset_toggle_interrupts() and continues execution, returning success. dm_resume() then dereferences the NULL cached_dc_state in link_enc_cfg_copy() and the following dc_state->stream_count loop, crashing during GPU reset recovery.

Return -ENOMEM immediately if the copy fails, so the caller aborts suspend instead of leaving a NULL cached state for resume.

(cherry picked from commit 84b6d7932fdd2857795a257f9f258562a3cddcab)

Affected

• Linux >= 8092aa3ab8f7b737a34b71f91492c676a843043a < 686baa1f4ec43b33e39e3d4b4a4539a91d17e883
• Linux >= 8092aa3ab8f7b737a34b71f91492c676a843043a < 197946faa1b7968046ba475ae2f266847c6f51ed
• Linux >= 8092aa3ab8f7b737a34b71f91492c676a843043a < 7283b78ca07ce491984a63f6288f3f8de5bdcb22
• Linux >= 8092aa3ab8f7b737a34b71f91492c676a843043a < 015e72cde567d2450e282c2790773463156b2d0a
• Linux ea000e4b4ee5363997715531cb3d024b4e5d561c
• Linux d0b8b23b9c2ebec693a36fea518d8f13493ad655
• Linux 83c7f509ef087041604e9572938f82e18b724c9d
• Linux 4cc2a94d96caeb3c975acdae7351c2f997c32175
• Linux 1686675405d07f35eae7ff3d13a530034b899df2
• Linux >= 5.10.258 < 5.11
• Linux >= 5.15.165 < 5.16
• Linux >= 6.1.105 < 6.2
• Linux >= 6.6.46 < 6.7
• Linux >= 6.10.5 < 6.11
• Linux 6.11

Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.