Non deterministic infinite loops in find_recursive, 1:8.31-2ubuntu2

[Mario Costa]

Pcre library overflows in:

in (pcre_compile.c:2180:register int c = *code;) c i assigned to a value in [0-255].

in (pcre_compile.c:2239:code += PRIV(OP_lengths)[c];) the array is accessed via c, value.

This array is initialized using define OP_LENGTHS in (pcre_internal.h:1854) with 155 entries.

pcre_tables.c:59:const pcre_uint8 PRIV(OP_lengths)[] = { OP_LENGTHS };

Executing a test, matching a regullar expression, sometimes, it enters an infinit loop, in find_recurse.

Due to return value of PRIV(OP_lengths)[c] == 0, having c outside the size of the array.

I'll further add a simple application to reproduce.

Can, any one familliar with pcre3 library clarify if this overflow is a real issue !?
Thanks!