# DF-1943 VERDICT

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

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

**Mechanism:** r600_dma.c L459 radeon_ring_lock(rdev,ring,num_loops*4+8). radeon_sync_rings radeon_sync.c:137-201 emits up to RADEON_NUM_SYNCS=4 semaphore_wait 3 dwords each=12 on destination ring. r600_dma_fence_ri

**Citation:** `sys/dev/drm/radeon/r600_dma.c:459-483`

**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.