OSV-2022-340 Heap-buffer-overflow in cli_ac_addsig

OSS-Fuzz report: https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=46646 Crash type: Heap-buffer-overflow READ 2 Crash state: cliacaddsig cliaddcontentmatchpattern readdbparseldbsubsignature...