# DF-1890 VERDICT

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

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

**Mechanism:** amdsbwd.c:217 timeout=(period*1000)/sc->ms_per_tick both operands int so multiplication performed in int overflows signed for period>2147483. Result assigned unsigned int timeout. C UB signed overflow

**Citation:** `sys/dev/misc/amdsbwd/amdsbwd.c:217-518`

**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.