# DF-1986 - Source Verification

## Verdict: REPRODUCED (source-only confirmation)

**Finding**: sys/dev/agp/agp_via.c:180-182

**Mechanism**: agp_via_attach returns ENXIO on initial_aperture==0 without calling agp_generic_detach (unlike the for-loop path at L195). Leaks /dev/agpgart cdev + freed softc access.

**Hardware dependency**: Requires VIA AGP bridge with zero initial aperture.

**Fix**: Call agp_generic_detach(dev) before returning ENXIO.

## Verification method
Source-only confirmation. The cited code path was traced line-by-line in the
audited sys/ tree. The bug exists exactly as described. This is a HW-gated
driver finding — the vulnerable code path requires specific hardware (GPU,
controller, PHY, TPM, etc.) not present in the QEMU audit guest. Runtime
reproduction on this guest is not possible without the hardware.

## Fix validation
fix.diff authored and applied to guest source. All 40 fixes in this batch
compile cleanly in a single combined kernel build: `make -j6 nativekernel
KERNCONF=X86_64_GENERIC` → rc=0, zero -Werror violations.

**Kernel**: DragonFly 6.5-DEVELOPMENT #0: Thu Jul  2 06:02:54 UTC 2026