# DF-1932 Verification

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

The cited defect exists in the audited source at `sys/dev/raid/aac/aac_pci.c:358-460`. 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)
aac (Adaptec) — aacp is in GENERIC but aac itself is built as module. Source: aac_pci_attach early-failure paths (bus-master, unknown hwif, BAR0/BAR1 alloc fail, IRQ fail, DMA tag fail) execute goto out L458 which runs aac_free(sc). aac_free at aac.c:613 kfree(sc->aac_commands) unconditionally; for early failures sc->aac_commands is NULL → kfree(NULL) panics (kern_slaballoc.c:1405 panic 'trying to free NULL pointer').

## Recommended fix
Guard `if (sc->aac_commands != NULL) kfree(...)` in aac_free.

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.