crypto/x509/x509_vfy.c:766: error: NULL_DEREFERENCE
  pointer `x` last assigned on line 765 could be null and is dereferenced by call to `lookup_cert_match()` at line 766, column 14.
Showing all 31 steps of the trace


crypto/x509/x509_vfy.c:712:1: start of procedure check_trust()
710.   }
711.   
712. > static int check_trust(X509_STORE_CTX *ctx, int num_untrusted)
713.   {
714.       int i;

crypto/x509/x509_vfy.c:715:5: 
713.   {
714.       int i;
715. >     X509 *x = NULL;
716.       X509 *mx;
717.       SSL_DANE *dane = ctx->dane;

crypto/x509/x509_vfy.c:717:5: 
715.       X509 *x = NULL;
716.       X509 *mx;
717. >     SSL_DANE *dane = ctx->dane;
718.       int num = sk_X509_num(ctx->chain);
719.       int trust;

crypto/x509/x509_vfy.c:718:5: 
716.       X509 *mx;
717.       SSL_DANE *dane = ctx->dane;
718. >     int num = sk_X509_num(ctx->chain);
719.       int trust;
720.   

include/openssl/x509.h:104:1: start of procedure sk_X509_num()
  102.   typedef struct x509_cinf_st X509_CINF;
  103.   
  104. > DEFINE_STACK_OF(X509)
  105.   
  106.   /* This is used for a table of trust checking functions */

crypto/stack/stack.c:265:1: start of procedure OPENSSL_sk_num()
    263.   }
    264.   
    265. > int OPENSSL_sk_num(const OPENSSL_STACK *st)
    266.   {
    267.       if (st == NULL)

crypto/stack/stack.c:267:9: Taking true branch
    265.   int OPENSSL_sk_num(const OPENSSL_STACK *st)
    266.   {
    267.       if (st == NULL)
                   ^
    268.           return -1;
    269.       return st->num;

crypto/stack/stack.c:268:9: 
    266.   {
    267.       if (st == NULL)
    268. >         return -1;
    269.       return st->num;
    270.   }

crypto/stack/stack.c:270:1: return from a call to OPENSSL_sk_num
    268.           return -1;
    269.       return st->num;
    270. > }
    271.   
    272.   void *OPENSSL_sk_value(const OPENSSL_STACK *st, int i)

include/openssl/x509.h:104:1: return from a call to sk_X509_num
  102.   typedef struct x509_cinf_st X509_CINF;
  103.   
  104. > DEFINE_STACK_OF(X509)
  105.   
  106.   /* This is used for a table of trust checking functions */

crypto/x509/x509_vfy.c:725:9: Taking true branch
723.        * match, we're done, otherwise we'll merely record the match depth.
724.        */
725.       if (DANETLS_HAS_TA(dane) && num_untrusted > 0 && num_untrusted < num) {
               ^
726.           switch (trust = check_dane_issuer(ctx, num_untrusted)) {
727.           case X509_TRUST_TRUSTED:

crypto/x509/x509_vfy.c:725:9: Taking false branch
723.        * match, we're done, otherwise we'll merely record the match depth.
724.        */
725.       if (DANETLS_HAS_TA(dane) && num_untrusted > 0 && num_untrusted < num) {
               ^
726.           switch (trust = check_dane_issuer(ctx, num_untrusted)) {
727.           case X509_TRUST_TRUSTED:

crypto/x509/x509_vfy.c:739:10: 
737.        * and wants to incrementally check just any added since.
738.        */
739. >     for (i = num_untrusted; i < num; i++) {
740.           x = sk_X509_value(ctx->chain, i);
741.           trust = X509_check_trust(x, ctx->param->trust, 0);

crypto/x509/x509_vfy.c:739:29: Loop condition is false. Leaving loop
737.        * and wants to incrementally check just any added since.
738.        */
739.       for (i = num_untrusted; i < num; i++) {
                                   ^
740.           x = sk_X509_value(ctx->chain, i);
741.           trust = X509_check_trust(x, ctx->param->trust, 0);

crypto/x509/x509_vfy.c:753:9: Taking false branch
751.        * the chain is PKIX trusted.
752.        */
753.       if (num_untrusted < num) {
               ^
754.           if (ctx->param->flags & X509_V_FLAG_PARTIAL_CHAIN)
755.               goto trusted;

crypto/x509/x509_vfy.c:759:9: Taking true branch
757.       }
758.   
759.       if (num_untrusted == num && ctx->param->flags & X509_V_FLAG_PARTIAL_CHAIN) {
               ^
760.           /*
761.            * Last-resort call with no new trusted certificates, check the leaf

crypto/x509/x509_vfy.c:759:33: Taking true branch
757.       }
758.   
759.       if (num_untrusted == num && ctx->param->flags & X509_V_FLAG_PARTIAL_CHAIN) {
                                       ^
760.           /*
761.            * Last-resort call with no new trusted certificates, check the leaf

crypto/x509/x509_vfy.c:764:9: 
762.            * for a direct trust store match.
763.            */
764. >         i = 0;
765.           x = sk_X509_value(ctx->chain, i);
766.           mx = lookup_cert_match(ctx, x);

crypto/x509/x509_vfy.c:765:9: 
763.            */
764.           i = 0;
765. >         x = sk_X509_value(ctx->chain, i);
766.           mx = lookup_cert_match(ctx, x);
767.           if (!mx)

include/openssl/x509.h:104:1: start of procedure sk_X509_value()
  102.   typedef struct x509_cinf_st X509_CINF;
  103.   
  104. > DEFINE_STACK_OF(X509)
  105.   
  106.   /* This is used for a table of trust checking functions */

crypto/stack/stack.c:272:1: start of procedure OPENSSL_sk_value()
    270.   }
    271.   
    272. > void *OPENSSL_sk_value(const OPENSSL_STACK *st, int i)
    273.   {
    274.       if (st == NULL || i < 0 || i >= st->num)

crypto/stack/stack.c:274:9: Taking true branch
    272.   void *OPENSSL_sk_value(const OPENSSL_STACK *st, int i)
    273.   {
    274.       if (st == NULL || i < 0 || i >= st->num)
                   ^
    275.           return NULL;
    276.       return st->data[i];

crypto/stack/stack.c:275:9: 
    273.   {
    274.       if (st == NULL || i < 0 || i >= st->num)
    275. >         return NULL;
    276.       return st->data[i];
    277.   }

crypto/stack/stack.c:277:1: return from a call to OPENSSL_sk_value
    275.           return NULL;
    276.       return st->data[i];
    277. > }
    278.   
    279.   void *OPENSSL_sk_set(OPENSSL_STACK *st, int i, void *value)

include/openssl/x509.h:104:1: return from a call to sk_X509_value
  102.   typedef struct x509_cinf_st X509_CINF;
  103.   
  104. > DEFINE_STACK_OF(X509)
  105.   
  106.   /* This is used for a table of trust checking functions */

crypto/x509/x509_vfy.c:766:9: 
764.           i = 0;
765.           x = sk_X509_value(ctx->chain, i);
766. >         mx = lookup_cert_match(ctx, x);
767.           if (!mx)
768.               return X509_TRUST_UNTRUSTED;

crypto/x509/x509_vfy.c:124:1: start of procedure lookup_cert_match()
  122.   /* Given a certificate try and find an exact match in the store */
  123.   
  124. > static X509 *lookup_cert_match(X509_STORE_CTX *ctx, X509 *x)
  125.   {
  126.       STACK_OF(X509) *certs;

crypto/x509/x509_vfy.c:127:5: 
  125.   {
  126.       STACK_OF(X509) *certs;
  127. >     X509 *xtmp = NULL;
  128.       int i;
  129.       /* Lookup all certs with matching subject name */

crypto/x509/x509_vfy.c:130:5: 
  128.       int i;
  129.       /* Lookup all certs with matching subject name */
  130. >     certs = ctx->lookup_certs(ctx, X509_get_subject_name(x));
  131.       if (certs == NULL)
  132.           return NULL;

crypto/x509/x509_cmp.c:100:1: start of procedure X509_get_subject_name()
    98.   #endif
    99.   
    100. > X509_NAME *X509_get_subject_name(X509 *a)
    101.   {
    102.       return (a->cert_info.subject);

crypto/x509/x509_cmp.c:102:5: 
    100.   X509_NAME *X509_get_subject_name(X509 *a)
    101.   {
    102. >     return (a->cert_info.subject);
    103.   }
    104.   
