crypto/x509/x509_vfy.c:771: error: NULL_DEREFERENCE
  pointer `x` last assigned on line 770 could be null and is dereferenced by call to `lookup_cert_match()` at line 771, column 14.
Showing all 31 steps of the trace


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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

crypto/x509/x509_vfy.c:771:9: 
769.           i = 0;
770.           x = sk_X509_value(ctx->chain, i);
771. >         mx = lookup_cert_match(ctx, x);
772.           if (!mx)
773.               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(const X509 *a)
    101.   {
    102.       return (a->cert_info.subject);

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