[gnutls-devel] libtasn1 | Reading CHOICE name confuses valgrind (#9)

Development of GNU's TLS library gnutls-devel at lists.gnutls.org
Thu Jul 18 16:16:07 CEST 2019

Nikos Mavrogiannopoulos commented:

The libtasn1 node contains the following:
struct asn1_node_st
  /* public fields: */
  char name[ASN1_MAX_NAME_SIZE + 1];    /* Node name */
  unsigned int name_hash;
  unsigned int type;            /* Node type */
  unsigned char *value;         /* Node value */
  int value_len;
  asn1_node down;               /* Pointer to the son node */
  asn1_node right;              /* Pointer to the brother node */
  asn1_node left;               /* Pointer to the next list element */
  /* private fields: */
  unsigned char small_value[ASN1_SMALL_VALUE_SIZE];     /* For small values */

  /* values used during decoding/coding */
  int tmp_ival;
  unsigned start; /* the start of the DER sequence - if decoded */
  unsigned end; /* the end of the DER sequence - if decoded */
It can store data <16 bytes inside the node (small_value), or allocate more data if larger. That from what you write seems to be related to allocated data in `_asn1_set_value`.

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