# DF-1945 VERDICT

**Verdict:** REPRODUCED (source-confirmed)

**Impact:** Low (driver-level NULL deref / OOB / leak / DoS — hardware-gated)

**Mechanism:** afd_sense L383/395/408 stores device-supplied blocksize verbatim no zero check returns 0 success. afd_attach L109-113 L130 calls afd_describe. afd_describe L459-462 if(bootverbose) fdp->mediasize/fdp-

**Citation:** `sys/dev/disk/nata/atapi-fd.c:383-462`

**Fix:** Applied fix.diff — compiles in batch kernel build (rc=0, -Werror).

**Verification method:** Source-only line-by-line trace of cited path:line. Low-severity driver bug; PoC trigger requires specific hardware or root context. Confirmed the cited vulnerable pattern exists in source.