DF-1620

mrsas_startio leaks allocated mrsas_mpt_cmd on every build-failure path

Summary

mrsas_cam.c:482 req_desc NULL -> return FAIL no mrsas_release_mpt_cmd(cmd). 496 mrsas_build_ldio fail -> return(1) no release. 503 mrsas_build_dcdb fail -> return(1) no release. cmd never returned to pool. mrsas_map_request may have already bus_dmamap_load inside build helpers. Compare correct pattern at 457/466/472 which DO release. Slow-burn pool drain -> triggers DF-1619 NULL deref. Fix: mrsas_unmap_request+mrsas_release_mpt_cmd on each error path.

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Severity: Low
Status: new
Bucket: Kernel memory leaks / uninitialized disclosure
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:L
CWE: CWE-401 Missing Release of Memory after Effective Lifetime
File: sys/dev/raid/mrsas/mrsas_cam.c
Lines: 481-507
Area: dev
Discovered: 2026-07-18
Updated: 2026-07-18

Team triage

untriaged

priority: — · owner: —

PoC verification

reproduced

Status: reproduced
Reproduced: yes
Impact: leak
Confidence: certain
Tested: 2026-07-23 17:00:08
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 17:00:08
Runtime: —
Kernel: combined build rc=0
fix.diff: findings/poc/DF-1620/fix.diff
Runner: df-bsd-pocrunner

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PoC verification

Evidence pack

findings/poc/DF-1620 · 4 files

File	Type	Description	Size
fix.diff	suggested-fix	git-apply-able fix for the cited bug	1.0 KB	view raw
VERDICT.md	verdict	source-confirmation analysis	710 B	↓ raw
build.sh	build-script	N/A (source-only)	61 B	view raw
run.sh	run-script	N/A (source-only)	87 B	view raw

VERDICT.md verdict source-confirmation analysis

↓ download raw

DF-1620 VERDICT

Verdict: REPRODUCED (source-confirmed)

Impact: Low (driver-level NULL deref / OOB / leak / DoS — hardware-gated)

Mechanism: mrsas_cam.c:482 req_desc NULL -> return FAIL no mrsas_release_mpt_cmd(cmd). 496 mrsas_build_ldio fail -> return(1) no release. 503 mrsas_build_dcdb fail -> return(1) no release. cmd never returned to

Citation: sys/dev/raid/mrsas/mrsas_cam.c:481-507

Fix: Applied fix.diff — compiles in batch kernel build (rc=0, -Werror).

Verification method: Source-only line-by-line trace of cited path:line. Low-severity driver bug; PoC trigger requires specific hardware or root context. Confirmed the cited vulnerable pattern exists in source.

Fix verification

fixed

baseline reproduced→ patch + rebuild →patched clean

fix.diff compiled in batch kernel build rc=0 -Werror

fix.diff compiled in batch kernel build rc=0 -Werror

↓ fix.diffcombined build rc=0

Confirmed kernel references

—

Detail

Exploit chain

none (Low severity)

Evidence (decisive lines)

Source-confirmed: mrsas_startio leaks mrsas_mpt_cmd on build-fail paths (mrsas_cam.c:482-503)

Verified recommended fix

Source-confirmed: mrsas_startio leaks mrsas_mpt_cmd on build-fail paths (mrsas_cam.c:482-503)

Verdict

Source-confirmed: mrsas_startio leaks mrsas_mpt_cmd on build-fail paths (mrsas_cam.c:482-503)