crypto/x509/x509_vfy.c:770: error: NULL_DEREFERENCE
  pointer `x` last assigned on line 769 could be null and is dereferenced by call to `lookup_cert_match()` at line 770, column 14.
Showing all 31 steps of the trace


crypto/x509/x509_vfy.c:716:1: start of procedure check_trust()
714.   }
715.   
716. > static int check_trust(X509_STORE_CTX *ctx, int num_untrusted)
717.   {
718.       int i;

crypto/x509/x509_vfy.c:719:5: 
717.   {
718.       int i;
719. >     X509 *x = NULL;
720.       X509 *mx;
721.       SSL_DANE *dane = ctx->dane;

crypto/x509/x509_vfy.c:721:5: 
719.       X509 *x = NULL;
720.       X509 *mx;
721. >     SSL_DANE *dane = ctx->dane;
722.       int num = sk_X509_num(ctx->chain);
723.       int trust;

crypto/x509/x509_vfy.c:722:5: 
720.       X509 *mx;
721.       SSL_DANE *dane = ctx->dane;
722. >     int num = sk_X509_num(ctx->chain);
723.       int trust;
724.   

include/openssl/x509.h:98:1: start of procedure sk_X509_num()
  96.   typedef struct x509_cinf_st X509_CINF;
  97.   
  98. > DEFINE_STACK_OF(X509)
  99.   
  100.   /* 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:98:1: return from a call to sk_X509_num
  96.   typedef struct x509_cinf_st X509_CINF;
  97.   
  98. > DEFINE_STACK_OF(X509)
  99.   
  100.   /* This is used for a table of trust checking functions */

crypto/x509/x509_vfy.c:729:9: Taking true branch
727.        * match, we're done, otherwise we'll merely record the match depth.
728.        */
729.       if (DANETLS_HAS_TA(dane) && num_untrusted > 0 && num_untrusted < num) {
               ^
730.           switch (trust = check_dane_issuer(ctx, num_untrusted)) {
731.           case X509_TRUST_TRUSTED:

crypto/x509/x509_vfy.c:729:9: Taking false branch
727.        * match, we're done, otherwise we'll merely record the match depth.
728.        */
729.       if (DANETLS_HAS_TA(dane) && num_untrusted > 0 && num_untrusted < num) {
               ^
730.           switch (trust = check_dane_issuer(ctx, num_untrusted)) {
731.           case X509_TRUST_TRUSTED:

crypto/x509/x509_vfy.c:743:10: 
741.        * and wants to incrementally check just any added since.
742.        */
743. >     for (i = num_untrusted; i < num; i++) {
744.           x = sk_X509_value(ctx->chain, i);
745.           trust = X509_check_trust(x, ctx->param->trust, 0);

crypto/x509/x509_vfy.c:743:29: Loop condition is false. Leaving loop
741.        * and wants to incrementally check just any added since.
742.        */
743.       for (i = num_untrusted; i < num; i++) {
                                   ^
744.           x = sk_X509_value(ctx->chain, i);
745.           trust = X509_check_trust(x, ctx->param->trust, 0);

crypto/x509/x509_vfy.c:757:9: Taking false branch
755.        * the chain is PKIX trusted.
756.        */
757.       if (num_untrusted < num) {
               ^
758.           if (ctx->param->flags & X509_V_FLAG_PARTIAL_CHAIN)
759.               goto trusted;

crypto/x509/x509_vfy.c:763:9: Taking true branch
761.       }
762.   
763.       if (num_untrusted == num && ctx->param->flags & X509_V_FLAG_PARTIAL_CHAIN) {
               ^
764.           /*
765.            * Last-resort call with no new trusted certificates, check the leaf

crypto/x509/x509_vfy.c:763:33: Taking true branch
761.       }
762.   
763.       if (num_untrusted == num && ctx->param->flags & X509_V_FLAG_PARTIAL_CHAIN) {
                                       ^
764.           /*
765.            * Last-resort call with no new trusted certificates, check the leaf

crypto/x509/x509_vfy.c:768:9: 
766.            * for a direct trust store match.
767.            */
768. >         i = 0;
769.           x = sk_X509_value(ctx->chain, i);
770.           mx = lookup_cert_match(ctx, x);

crypto/x509/x509_vfy.c:769:9: 
767.            */
768.           i = 0;
769. >         x = sk_X509_value(ctx->chain, i);
770.           mx = lookup_cert_match(ctx, x);
771.           if (!mx)

include/openssl/x509.h:98:1: start of procedure sk_X509_value()
  96.   typedef struct x509_cinf_st X509_CINF;
  97.   
  98. > DEFINE_STACK_OF(X509)
  99.   
  100.   /* 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:98:1: return from a call to sk_X509_value
  96.   typedef struct x509_cinf_st X509_CINF;
  97.   
  98. > DEFINE_STACK_OF(X509)
  99.   
  100.   /* This is used for a table of trust checking functions */

crypto/x509/x509_vfy.c:770:9: 
768.           i = 0;
769.           x = sk_X509_value(ctx->chain, i);
770. >         mx = lookup_cert_match(ctx, x);
771.           if (!mx)
772.               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.   
