# DF-1832 - Source Verification

## Verdict: REPRODUCED (source-only confirmation)

**Finding**: sys/dev/drm/i915/intel_hotplug.c:233,566

**Mechanism**: intel_hpd_irq_storm_reenable_work (L233) and i915_hpd_poll_init_work (L566) deref intel_connector->encoder->hpd_pin without NULL guard that sibling functions implement. NULL page fault if encoder==NULL during connector init window.

**Hardware dependency**: Requires i915 GPU with hotplug storm or poll-init race.

**Fix**: Add intel_connector->encoder NULL check before dereferencing hpd_pin.

## 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