crypto/x509/x509_vfy.c:773: error: NULL_DEREFERENCE
  pointer `x` last assigned on line 772 could be null and is dereferenced by call to `lookup_cert_match()` at line 773, column 14.
Showing all 31 steps of the trace


crypto/x509/x509_vfy.c:719:1: start of procedure check_trust()
717.   }
718.   
719. > static int check_trust(X509_STORE_CTX *ctx, int num_untrusted)
720.   {
721.       int i;

crypto/x509/x509_vfy.c:722:5: 
720.   {
721.       int i;
722. >     X509 *x = NULL;
723.       X509 *mx;
724.       SSL_DANE *dane = ctx->dane;

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

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

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

crypto/stack/stack.c:338:1: start of procedure OPENSSL_sk_num()
    336.   }
    337.   
    338. > int OPENSSL_sk_num(const OPENSSL_STACK *st)
    339.   {
    340.       if (st == NULL)

crypto/stack/stack.c:340:9: Taking true branch
    338.   int OPENSSL_sk_num(const OPENSSL_STACK *st)
    339.   {
    340.       if (st == NULL)
                   ^
    341.           return -1;
    342.       return st->num;

crypto/stack/stack.c:341:9: 
    339.   {
    340.       if (st == NULL)
    341. >         return -1;
    342.       return st->num;
    343.   }

crypto/stack/stack.c:343:1: return from a call to OPENSSL_sk_num
    341.           return -1;
    342.       return st->num;
    343. > }
    344.   
    345.   void *OPENSSL_sk_value(const OPENSSL_STACK *st, int i)

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

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

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

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

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

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

crypto/x509/x509_vfy.c:766:9: Taking true branch
764.       }
765.   
766.       if (num_untrusted == num && ctx->param->flags & X509_V_FLAG_PARTIAL_CHAIN) {
               ^
767.           /*
768.            * Last-resort call with no new trusted certificates, check the leaf

crypto/x509/x509_vfy.c:766:33: Taking true branch
764.       }
765.   
766.       if (num_untrusted == num && ctx->param->flags & X509_V_FLAG_PARTIAL_CHAIN) {
                                       ^
767.           /*
768.            * Last-resort call with no new trusted certificates, check the leaf

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

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

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

crypto/stack/stack.c:345:1: start of procedure OPENSSL_sk_value()
    343.   }
    344.   
    345. > void *OPENSSL_sk_value(const OPENSSL_STACK *st, int i)
    346.   {
    347.       if (st == NULL || i < 0 || i >= st->num)

crypto/stack/stack.c:347:9: Taking true branch
    345.   void *OPENSSL_sk_value(const OPENSSL_STACK *st, int i)
    346.   {
    347.       if (st == NULL || i < 0 || i >= st->num)
                   ^
    348.           return NULL;
    349.       return (void *)st->data[i];

crypto/stack/stack.c:348:9: 
    346.   {
    347.       if (st == NULL || i < 0 || i >= st->num)
    348. >         return NULL;
    349.       return (void *)st->data[i];
    350.   }

crypto/stack/stack.c:350:1: return from a call to OPENSSL_sk_value
    348.           return NULL;
    349.       return (void *)st->data[i];
    350. > }
    351.   
    352.   void *OPENSSL_sk_set(OPENSSL_STACK *st, int i, const void *data)

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

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