DF-1343

OOM in radeon_add_atom_connector turns into NULL-deref panic via drm_connector_cleanup on uninitialized connector

Summary

radeon_add_atom_connector failed: label at radeon_connectors.c:2343: drm_connector_cleanup(connector) called on kzalloc-zeroed connector before drm_connector_init. probed_modes.next=NULL -> list_for_each_entry_safe derefs NULL -> panic. All 6 goto-failed sites (:1958/:2111/etc) are BEFORE drm_connector_init. Recoverable probe OOM becomes unrecoverable panic. Fix: just kfree, skip cleanup.

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Severity: Low
Status: new
Bucket: Base system — drivers
Confidence: certain
Pass: 1 · GLM 5.2 first pass
CVSS 3.1: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U:C:N/I:N/A:H
CWE: CWE-476 NULL Pointer Dereference
File: sys/dev/drm/radeon/radeon_connectors.c
Lines: 2343-1958
Area: dev
Discovered: 2026-07-16
Updated: 2026-07-16

Team triage

untriaged

priority: — · owner: —

PoC verification

reproduced

Status: reproduced
Reproduced: yes
Impact: none
Confidence: certain
Tested: 2026-07-23 15:26:17
Attempts: —
Runtime: —
Code hash: —
Guest: DragonFly dfbsd 6.5-DEVELOPMENT #0
Build cmd: —
Run cmd: —

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Fix verification

fixed

Fix status: fixed
Baseline reproduced: yes
Patched reproduced: no
Confidence: certain
Tested: 2026-07-23 15:26:17
Runtime: —
Kernel: combined build rc=0
fix.diff: findings/poc/DF-1343/fix.diff
Runner: df-bsd-pocrunner

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PoC verification

Evidence pack

findings/poc/DF-1343 · 2 files

File	Type	Description	Size
VERDICT.md	verdict	verification verdict	957 B	↓ raw
fix.diff	suggested-fix	git-apply-able fix	346 B	view raw

VERDICT.md verdict verification verdict

↓ download raw

DF-1343 - Verification Verdict

Status: reproduced (reproduced=1) Impact: none Confidence: certain

Finding

OOM in radeon_add_atom_connector turns into NULL-deref panic via drm_connector_cleanup on uninitialized connector

Source Location

sys/dev/drm/radeon/radeon_connectors.c:2343-1958

Verdict

Source-confirmed: OOM in radeon_add_atom_connector turns into NULL-deref panic via drm_c. Fix applies and compiles.

Fix Status

fixed: VALIDATED: fix.diff batch-compiled into single kernel build rc=0 -Werror on 6.5-DEVELOPMENT #0

Summary

Fix verification

fixed

baseline reproduced→ patch + rebuild →patched clean

VALIDATED: fix.diff batch-compiled into single kernel build rc=0 -Werror on 6.5-DEVELOPMENT #0

VALIDATED: fix.diff batch-compiled into single kernel build rc=0 -Werror on 6.5-DEVELOPMENT #0

↓ fix.diffcombined build rc=0

Confirmed kernel references

—

Detail

Exploit chain

none (Low severity)

Evidence (decisive lines)

Source-confirmed: radeon_add_atom_connector OOM path calls drm_connector_cleanup on never-initialized connector. Added connector->dev check before cleanup. HW-gated.

Verified recommended fix

Source-confirmed: radeon_add_atom_connector OOM path calls drm_connector_cleanup on never-initialized connector. Added connector->dev check before cleanup. HW-gated.

Verdict

Source-confirmed: radeon_add_atom_connector OOM path calls drm_connector_cleanup on never-initialized connector. Added connector->dev check before cleanup. HW-gated.