OSV-2022-1079 Stack-buffer-overflow in add_ff_action

OSS-Fuzz report: https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=52596 Crash type: Stack-buffer-overflow WRITE 9 Crash state: addffaction dissectieeeNUMBERpv0 dissectieeeNUMBERcommon...