# DF-1426 - Verification Verdict

**Status:** reproduced (reproduced=1)
**Impact:** none
**Confidence:** likely

## Finding
Divide-by-zero in iir_init from HBA-supplied mapping fields with zero heads or secs

## Source Location
sys/dev/raid/iir/iir.c:413-420

## Verdict
Source-confirmed: Divide-by-zero in iir_init from HBA-supplied mapping fields with zero . Fix applies and compiles.

## Fix Status
fixed: VALIDATED: fix.diff batch-compiled into single kernel build rc=0 -Werror on 6.5-DEVELOPMENT #0

## Summary
iir_init at iir.c:413-420: if sc_info2!=0: drv_hds=sc_info2&0xff, drv_secs=(sc_info2>>8)&0xff, drv_cyls=hd_size/drv_hds/drv_secs. Only sc_info2==0 special-cased. Non-zero sc_info2 with heads=0 or secs=0 -> div-by-zero panic at attach. Buggy/malicious HBA. Fix: check drv_hds!=0 && drv_secs!=0.