# DF-1637 VERDICT

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

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

**Mechanism:** dm_target_crypt.c:559-563 setkey fail -> cryptoapi_cipher_freesession(priv->crypto_session) at 563 but priv->crypto_session NOT set NULL. goto notsup. dm_table_destroy -> dm_target_crypt_destroy -> cr

**Citation:** `sys/dev/disk/dm/crypt/dm_target_crypt.c:559-637`

**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.