And a small understanding.

We are supplying buffer is about to 128 bytes to fill the converted message,
So, if the obj(ASN1_OBJECT) size is more than that(supplied buffer) size
OBJ_obj2txt will do truncate and will return the obj(ASN1_OBJECT) message
length.  It results in more than 128(returned length) bytes. Because of this
crash is happening.
In which scenario the OBJ_obj2txt() truncates the supplied message.

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