DF-1331

NULL pointer dereference in attach error path when cfg is unset

Summary

envy24ht_pci_attach bad: path at :2527: if(sc->cfg->codec->destroy!=NULL). sc->cfg=NULL (bzero) when envy24ht_alloc_resource fails before envy24ht_init sets cfg. Same in detach at :2562. Malicious/defective PCI device or resource exhaustion. Sibling of DF-1322. Fix: check sc->cfg!=NULL && sc->cfg->codec!=NULL.

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Severity: Low
Status: new
Bucket: Base system — drivers
Confidence: likely
Pass: 1 · GLM 5.2 first pass
CVSS 3.1: CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U:C:N/I:N/A:H
CWE: CWE-476 NULL Pointer Dereference
File: sys/dev/sound/pci/envy24ht.c
Lines: 2519-2562
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: likely
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: likely
Tested: 2026-07-23 15:26:17
Runtime: —
Kernel: combined build rc=0
fix.diff: findings/poc/DF-1331/fix.diff
Runner: df-bsd-pocrunner

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PoC verification

Evidence pack

findings/poc/DF-1331 · 2 files

File	Type	Description	Size
VERDICT.md	verdict	verification verdict	809 B	↓ raw
fix.diff	suggested-fix	git-apply-able fix	512 B	view raw

VERDICT.md verdict verification verdict

↓ download raw

DF-1331 - Verification Verdict

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

Finding

NULL pointer dereference in attach error path when cfg is unset

Source Location

sys/dev/sound/pci/envy24ht.c:2519-2562

Verdict

Source-confirmed: NULL pointer dereference in attach error path when cfg is unset. 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: envy24ht attach error path dereferences sc->cfg->codec->destroy when sc->cfg may be NULL. Added sc->cfg!=NULL guard. HW-gated.

Verified recommended fix

Source-confirmed: envy24ht attach error path dereferences sc->cfg->codec->destroy when sc->cfg may be NULL. Added sc->cfg!=NULL guard. HW-gated.

Verdict

Source-confirmed: envy24ht attach error path dereferences sc->cfg->codec->destroy when sc->cfg may be NULL. Added sc->cfg!=NULL guard. HW-gated.