# DF-1846 VERDICT

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

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

**Mechanism:** gpio_map L211-226 walks bit mask; if pin invalid mid-loop returns NULL but leaves pin_mapped=1 on every pin successfully processed before bad one. Those pins permanently unusable (subsequent open/map 

**Citation:** `sys/dev/misc/gpio/gpio.c:211-226`

**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.