crypto/x509/x509_vfy.c:756: error: NULL_DEREFERENCE
  pointer `x` last assigned on line 745 could be null and is dereferenced by call to `get_crl_delta()` at line 756, column 9.
Showing all 25 steps of the trace


crypto/x509/x509_vfy.c:739:1: start of procedure check_cert()
737.   	}
738.   
739. > static int check_cert(X509_STORE_CTX *ctx)
740.   	{
741.   	X509_CRL *crl = NULL, *dcrl = NULL;

crypto/x509/x509_vfy.c:741:2: 
739.   static int check_cert(X509_STORE_CTX *ctx)
740.   	{
741. > 	X509_CRL *crl = NULL, *dcrl = NULL;
742.   	X509 *x;
743.   	int ok, cnum;

crypto/x509/x509_vfy.c:744:2: 
742.   	X509 *x;
743.   	int ok, cnum;
744. > 	cnum = ctx->error_depth;
745.   	x = sk_X509_value(ctx->chain, cnum);
746.   	ctx->current_cert = x;

crypto/x509/x509_vfy.c:745:6: Condition is true
743.   	int ok, cnum;
744.   	cnum = ctx->error_depth;
745.   	x = sk_X509_value(ctx->chain, cnum);
            ^
746.   	ctx->current_cert = x;
747.   	ctx->current_issuer = NULL;

crypto/x509/x509_vfy.c:745:2: 
743.   	int ok, cnum;
744.   	cnum = ctx->error_depth;
745. > 	x = sk_X509_value(ctx->chain, cnum);
746.   	ctx->current_cert = x;
747.   	ctx->current_issuer = NULL;

crypto/stack/stack.c:300:1: start of procedure sk_value()
  298.   }
  299.   
  300. > void *sk_value(const _STACK *st, int i)
  301.   {
  302.   	if(!st || (i < 0) || (i >= st->num)) return NULL;

crypto/stack/stack.c:302:6: Taking false branch
  300.   void *sk_value(const _STACK *st, int i)
  301.   {
  302.   	if(!st || (i < 0) || (i >= st->num)) return NULL;
              ^
  303.   	return st->data[i];
  304.   }

crypto/stack/stack.c:302:13: Taking false branch
  300.   void *sk_value(const _STACK *st, int i)
  301.   {
  302.   	if(!st || (i < 0) || (i >= st->num)) return NULL;
                     ^
  303.   	return st->data[i];
  304.   }

crypto/stack/stack.c:302:24: Taking true branch
  300.   void *sk_value(const _STACK *st, int i)
  301.   {
  302.   	if(!st || (i < 0) || (i >= st->num)) return NULL;
                                ^
  303.   	return st->data[i];
  304.   }

crypto/stack/stack.c:302:39: 
  300.   void *sk_value(const _STACK *st, int i)
  301.   {
  302. > 	if(!st || (i < 0) || (i >= st->num)) return NULL;
  303.   	return st->data[i];
  304.   }

crypto/stack/stack.c:304:1: return from a call to sk_value
  302.   	if(!st || (i < 0) || (i >= st->num)) return NULL;
  303.   	return st->data[i];
  304. > }
  305.   
  306.   void *sk_set(_STACK *st, int i, void *value)

crypto/x509/x509_vfy.c:746:2: 
744.   	cnum = ctx->error_depth;
745.   	x = sk_X509_value(ctx->chain, cnum);
746. > 	ctx->current_cert = x;
747.   	ctx->current_issuer = NULL;
748.   	ctx->current_crl_score = 0;

crypto/x509/x509_vfy.c:747:2: 
745.   	x = sk_X509_value(ctx->chain, cnum);
746.   	ctx->current_cert = x;
747. > 	ctx->current_issuer = NULL;
748.   	ctx->current_crl_score = 0;
749.   	ctx->current_reasons = 0;

crypto/x509/x509_vfy.c:748:2: 
746.   	ctx->current_cert = x;
747.   	ctx->current_issuer = NULL;
748. > 	ctx->current_crl_score = 0;
749.   	ctx->current_reasons = 0;
750.   	while (ctx->current_reasons != CRLDP_ALL_REASONS)

crypto/x509/x509_vfy.c:749:2: 
747.   	ctx->current_issuer = NULL;
748.   	ctx->current_crl_score = 0;
749. > 	ctx->current_reasons = 0;
750.   	while (ctx->current_reasons != CRLDP_ALL_REASONS)
751.   		{

crypto/x509/x509_vfy.c:750:9: Loop condition is true. Entering loop body
748.   	ctx->current_crl_score = 0;
749.   	ctx->current_reasons = 0;
750.   	while (ctx->current_reasons != CRLDP_ALL_REASONS)
               ^
751.   		{
752.   		/* Try to retrieve relevant CRL */

crypto/x509/x509_vfy.c:753:7: Taking false branch
751.   		{
752.   		/* Try to retrieve relevant CRL */
753.   		if (ctx->get_crl)
             ^
754.   			ok = ctx->get_crl(ctx, &crl, x);
755.   		else

crypto/x509/x509_vfy.c:756:4: 
754.   			ok = ctx->get_crl(ctx, &crl, x);
755.   		else
756. > 			ok = get_crl_delta(ctx, &crl, &dcrl, x);
757.   		/* If error looking up CRL, nothing we can do except
758.   		 * notify callback

crypto/x509/x509_vfy.c:1339:1: start of procedure get_crl_delta()
  1337.    */
  1338.   	
  1339. > static int get_crl_delta(X509_STORE_CTX *ctx,
  1340.   				X509_CRL **pcrl, X509_CRL **pdcrl, X509 *x)
  1341.   	{

crypto/x509/x509_vfy.c:1343:2: 
  1341.   	{
  1342.   	int ok;
  1343. > 	X509 *issuer = NULL;
  1344.   	int crl_score = 0;
  1345.   	unsigned int reasons;

crypto/x509/x509_vfy.c:1344:2: 
  1342.   	int ok;
  1343.   	X509 *issuer = NULL;
  1344. > 	int crl_score = 0;
  1345.   	unsigned int reasons;
  1346.   	X509_CRL *crl = NULL, *dcrl = NULL;

crypto/x509/x509_vfy.c:1346:2: 
  1344.   	int crl_score = 0;
  1345.   	unsigned int reasons;
  1346. > 	X509_CRL *crl = NULL, *dcrl = NULL;
  1347.   	STACK_OF(X509_CRL) *skcrl;
  1348.   	X509_NAME *nm = X509_get_issuer_name(x);

crypto/x509/x509_vfy.c:1348:2: 
  1346.   	X509_CRL *crl = NULL, *dcrl = NULL;
  1347.   	STACK_OF(X509_CRL) *skcrl;
  1348. > 	X509_NAME *nm = X509_get_issuer_name(x);
  1349.   	reasons = ctx->current_reasons;
  1350.   	ok = get_crl_sk(ctx, &crl, &dcrl, 

crypto/x509/x509_cmp.c:130:1: start of procedure X509_get_issuer_name()
    128.   #endif
    129.   
    130. > X509_NAME *X509_get_issuer_name(X509 *a)
    131.   	{
    132.   	return(a->cert_info->issuer);

crypto/x509/x509_cmp.c:132:2: 
    130.   X509_NAME *X509_get_issuer_name(X509 *a)
    131.   	{
    132. > 	return(a->cert_info->issuer);
    133.   	}
    134.   
