# DF-0270 -- Low

## Verdict: REPRODUCED (source-confirmed)

REAL: PAP_ACK/PAP_NAK debug guard is name_len < len+4 but should be name_len < len-4 (name at offset 5, name_len at offset 4) -- off by 8; sppp_print_string walks past valid mbuf data -> stale bytes to syslog. IFF_DEBUG only.

## Impact ceiling
none

## Cited refs
- sys/net/sppp/if_spppsubr.c:4390
- sys/net/sppp/if_spppsubr.c:4426

## Fix
Fix both sites: len+4 -> len-4.

## Validation
Combined 60-finding fix kernel (findings/poc/_low_merged.patch) built `make -j6 nativekernel KERNCONF=X86_64_GENERIC` => rc=0, 0 errors, -Werror. fix_status=fixed.