# DF-1921 Verification

## Verdict
**SOURCE-CONFIRMED, INCONCLUSIVE-RUNTIME (HW/module gated).**

The cited defect exists in the audited source at `sys/dev/raid/mrsas/mrsas_ioctl.c:193-250`. Reproduction
on the running guest is **not possible** because the affected code path is
gated behind hardware that is not present in the audit QEMU/KVM guest
(no AMD/i915 GPU, no LSI MegaRAID, no MMC/SDHCI controller, no FireWire, no
ATAPI floppy, etc.) and/or lives in a kernel module that is not loaded on the
GENERIC-running guest.

## Mechanism (source-only confirmation)
mrsas IS in GENERIC but no HW. Source: L193 cmd=mrsas_get_mfi_cmd removes from free list (32 total). Error branches L237/243/250 (tag_create/dmamem_alloc/dmamap_load) and sense L278/283/289 return(ENOMEM) directly, bypassing the out: label which releases cmd at L367 (mrsas_release_mfi_cmd). Repeated failures exhaust the 32-cmd pool → DoS.

## Recommended fix
Replace the early return (ENOMEM) with goto out so cmd is released via the existing cleanup.

The full `git apply`-able diff lives in `fix.diff` in this folder; it was
applied as part of a single combined 41-finding kernel build that compiled
cleanly (rc=0, -Werror clean) — see `../fix_build_summary.txt`.

## Build validation
* `git apply --check` on this fix.diff: **OK**
* Combined kernel build (`X86_64_GENERIC`, INVARIANTS ON) with all 41
  findings' fix.diffs applied: **rc=0**, no warnings, no errors.
* The patched kernel was not booted/run because the affected code path
  requires hardware that the audit guest does not have.