crypto/x509/x509_vfy.c:774: error: NULL_DEREFERENCE
  pointer `x` last assigned on line 773 could be null and is dereferenced by call to `lookup_cert_match()` at line 774, column 14.
Showing all 31 steps of the trace


crypto/x509/x509_vfy.c:720:1: start of procedure check_trust()
718.   }
719.   
720. > static int check_trust(X509_STORE_CTX *ctx, int num_untrusted)
721.   {
722.       int i;

crypto/x509/x509_vfy.c:723:5: 
721.   {
722.       int i;
723. >     X509 *x = NULL;
724.       X509 *mx;
725.       SSL_DANE *dane = ctx->dane;

crypto/x509/x509_vfy.c:725:5: 
723.       X509 *x = NULL;
724.       X509 *mx;
725. >     SSL_DANE *dane = ctx->dane;
726.       int num = sk_X509_num(ctx->chain);
727.       int trust;

crypto/x509/x509_vfy.c:726:5: 
724.       X509 *mx;
725.       SSL_DANE *dane = ctx->dane;
726. >     int num = sk_X509_num(ctx->chain);
727.       int trust;
728.   

include/openssl/x509.h:100:1: start of procedure sk_X509_num()
  98.   typedef struct x509_cinf_st X509_CINF;
  99.   
  100. > DEFINE_STACK_OF(X509)
  101.   
  102.   /* This is used for a table of trust checking functions */

crypto/stack/stack.c:277:1: start of procedure OPENSSL_sk_num()
    275.   }
    276.   
    277. > int OPENSSL_sk_num(const OPENSSL_STACK *st)
    278.   {
    279.       if (st == NULL)

crypto/stack/stack.c:279:9: Taking true branch
    277.   int OPENSSL_sk_num(const OPENSSL_STACK *st)
    278.   {
    279.       if (st == NULL)
                   ^
    280.           return -1;
    281.       return st->num;

crypto/stack/stack.c:280:9: 
    278.   {
    279.       if (st == NULL)
    280. >         return -1;
    281.       return st->num;
    282.   }

crypto/stack/stack.c:282:1: return from a call to OPENSSL_sk_num
    280.           return -1;
    281.       return st->num;
    282. > }
    283.   
    284.   void *OPENSSL_sk_value(const OPENSSL_STACK *st, int i)

include/openssl/x509.h:100:1: return from a call to sk_X509_num
  98.   typedef struct x509_cinf_st X509_CINF;
  99.   
  100. > DEFINE_STACK_OF(X509)
  101.   
  102.   /* This is used for a table of trust checking functions */

crypto/x509/x509_vfy.c:733:9: Taking true branch
731.        * match, we're done, otherwise we'll merely record the match depth.
732.        */
733.       if (DANETLS_HAS_TA(dane) && num_untrusted > 0 && num_untrusted < num) {
               ^
734.           switch (trust = check_dane_issuer(ctx, num_untrusted)) {
735.           case X509_TRUST_TRUSTED:

crypto/x509/x509_vfy.c:733:9: Taking false branch
731.        * match, we're done, otherwise we'll merely record the match depth.
732.        */
733.       if (DANETLS_HAS_TA(dane) && num_untrusted > 0 && num_untrusted < num) {
               ^
734.           switch (trust = check_dane_issuer(ctx, num_untrusted)) {
735.           case X509_TRUST_TRUSTED:

crypto/x509/x509_vfy.c:747:10: 
745.        * and wants to incrementally check just any added since.
746.        */
747. >     for (i = num_untrusted; i < num; i++) {
748.           x = sk_X509_value(ctx->chain, i);
749.           trust = X509_check_trust(x, ctx->param->trust, 0);

crypto/x509/x509_vfy.c:747:29: Loop condition is false. Leaving loop
745.        * and wants to incrementally check just any added since.
746.        */
747.       for (i = num_untrusted; i < num; i++) {
                                   ^
748.           x = sk_X509_value(ctx->chain, i);
749.           trust = X509_check_trust(x, ctx->param->trust, 0);

crypto/x509/x509_vfy.c:761:9: Taking false branch
759.        * the chain is PKIX trusted.
760.        */
761.       if (num_untrusted < num) {
               ^
762.           if (ctx->param->flags & X509_V_FLAG_PARTIAL_CHAIN)
763.               goto trusted;

crypto/x509/x509_vfy.c:767:9: Taking true branch
765.       }
766.   
767.       if (num_untrusted == num && ctx->param->flags & X509_V_FLAG_PARTIAL_CHAIN) {
               ^
768.           /*
769.            * Last-resort call with no new trusted certificates, check the leaf

crypto/x509/x509_vfy.c:767:33: Taking true branch
765.       }
766.   
767.       if (num_untrusted == num && ctx->param->flags & X509_V_FLAG_PARTIAL_CHAIN) {
                                       ^
768.           /*
769.            * Last-resort call with no new trusted certificates, check the leaf

crypto/x509/x509_vfy.c:772:9: 
770.            * for a direct trust store match.
771.            */
772. >         i = 0;
773.           x = sk_X509_value(ctx->chain, i);
774.           mx = lookup_cert_match(ctx, x);

crypto/x509/x509_vfy.c:773:9: 
771.            */
772.           i = 0;
773. >         x = sk_X509_value(ctx->chain, i);
774.           mx = lookup_cert_match(ctx, x);
775.           if (!mx)

include/openssl/x509.h:100:1: start of procedure sk_X509_value()
  98.   typedef struct x509_cinf_st X509_CINF;
  99.   
  100. > DEFINE_STACK_OF(X509)
  101.   
  102.   /* This is used for a table of trust checking functions */

crypto/stack/stack.c:284:1: start of procedure OPENSSL_sk_value()
    282.   }
    283.   
    284. > void *OPENSSL_sk_value(const OPENSSL_STACK *st, int i)
    285.   {
    286.       if (st == NULL || i < 0 || i >= st->num)

crypto/stack/stack.c:286:9: Taking true branch
    284.   void *OPENSSL_sk_value(const OPENSSL_STACK *st, int i)
    285.   {
    286.       if (st == NULL || i < 0 || i >= st->num)
                   ^
    287.           return NULL;
    288.       return (void *)st->data[i];

crypto/stack/stack.c:287:9: 
    285.   {
    286.       if (st == NULL || i < 0 || i >= st->num)
    287. >         return NULL;
    288.       return (void *)st->data[i];
    289.   }

crypto/stack/stack.c:289:1: return from a call to OPENSSL_sk_value
    287.           return NULL;
    288.       return (void *)st->data[i];
    289. > }
    290.   
    291.   void *OPENSSL_sk_set(OPENSSL_STACK *st, int i, const void *data)

include/openssl/x509.h:100:1: return from a call to sk_X509_value
  98.   typedef struct x509_cinf_st X509_CINF;
  99.   
  100. > DEFINE_STACK_OF(X509)
  101.   
  102.   /* This is used for a table of trust checking functions */

crypto/x509/x509_vfy.c:774:9: 
772.           i = 0;
773.           x = sk_X509_value(ctx->chain, i);
774. >         mx = lookup_cert_match(ctx, x);
775.           if (!mx)
776.               return X509_TRUST_UNTRUSTED;

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

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

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

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

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