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Prevent definite map length overflow #39

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Prevent definite map length overflow #39

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5 changes: 3 additions & 2 deletions ext/cbor/unpacker.c
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Original file line number Diff line number Diff line change
Expand Up @@ -395,7 +395,9 @@ static int read_primitive(msgpack_unpacker_t* uk)
if (val == 0) {
return object_complete(uk, rb_hash_new());
}
return _msgpack_unpacker_stack_push(uk, STACK_TYPE_MAP_KEY, val*2, rb_hash_new());
return _msgpack_unpacker_stack_push(uk, STACK_TYPE_MAP_KEY,
val > SIZE_MAX / 2 ? SIZE_MAX : val*2,
rb_hash_new());
CASE_AI(MT_TAG):
READ_VAL(uk, ai, val);
CASE_IMM(MT_TAG): // tag
Expand Down Expand Up @@ -773,4 +775,3 @@ int msgpack_unpacker_skip_nil(msgpack_unpacker_t* uk)
}
return 0;
}