crypto/x509/x509_vfy.c:856: error: NULL_DEREFERENCE
  pointer `x` last assigned on line 844 could be null and is dereferenced by call to `get_crl_delta()` at line 856, column 9.
Showing all 26 steps of the trace


crypto/x509/x509_vfy.c:837:1: start of procedure check_cert()
835.   	}
836.   
837. > static int check_cert(X509_STORE_CTX *ctx)
838.   	{
839.   	X509_CRL *crl = NULL, *dcrl = NULL;

crypto/x509/x509_vfy.c:839:2: 
837.   static int check_cert(X509_STORE_CTX *ctx)
838.   	{
839. > 	X509_CRL *crl = NULL, *dcrl = NULL;
840.   	X509 *x;
841.   	int ok, cnum;

crypto/x509/x509_vfy.c:843:2: 
841.   	int ok, cnum;
842.   	unsigned int last_reasons;
843. > 	cnum = ctx->error_depth;
844.   	x = sk_X509_value(ctx->chain, cnum);
845.   	ctx->current_cert = x;

crypto/x509/x509_vfy.c:844:6: Condition is true
842.   	unsigned int last_reasons;
843.   	cnum = ctx->error_depth;
844.   	x = sk_X509_value(ctx->chain, cnum);
            ^
845.   	ctx->current_cert = x;
846.   	ctx->current_issuer = NULL;

crypto/x509/x509_vfy.c:844:2: 
842.   	unsigned int last_reasons;
843.   	cnum = ctx->error_depth;
844. > 	x = sk_X509_value(ctx->chain, cnum);
845.   	ctx->current_cert = x;
846.   	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:845:2: 
843.   	cnum = ctx->error_depth;
844.   	x = sk_X509_value(ctx->chain, cnum);
845. > 	ctx->current_cert = x;
846.   	ctx->current_issuer = NULL;
847.   	ctx->current_crl_score = 0;

crypto/x509/x509_vfy.c:846:2: 
844.   	x = sk_X509_value(ctx->chain, cnum);
845.   	ctx->current_cert = x;
846. > 	ctx->current_issuer = NULL;
847.   	ctx->current_crl_score = 0;
848.   	ctx->current_reasons = 0;

crypto/x509/x509_vfy.c:847:2: 
845.   	ctx->current_cert = x;
846.   	ctx->current_issuer = NULL;
847. > 	ctx->current_crl_score = 0;
848.   	ctx->current_reasons = 0;
849.   	while (ctx->current_reasons != CRLDP_ALL_REASONS)

crypto/x509/x509_vfy.c:848:2: 
846.   	ctx->current_issuer = NULL;
847.   	ctx->current_crl_score = 0;
848. > 	ctx->current_reasons = 0;
849.   	while (ctx->current_reasons != CRLDP_ALL_REASONS)
850.   		{

crypto/x509/x509_vfy.c:849:9: Loop condition is true. Entering loop body
847.   	ctx->current_crl_score = 0;
848.   	ctx->current_reasons = 0;
849.   	while (ctx->current_reasons != CRLDP_ALL_REASONS)
               ^
850.   		{
851.   		last_reasons = ctx->current_reasons;

crypto/x509/x509_vfy.c:851:3: 
849.   	while (ctx->current_reasons != CRLDP_ALL_REASONS)
850.   		{
851. > 		last_reasons = ctx->current_reasons;
852.   		/* Try to retrieve relevant CRL */
853.   		if (ctx->get_crl)

crypto/x509/x509_vfy.c:853:7: Taking false branch
851.   		last_reasons = ctx->current_reasons;
852.   		/* Try to retrieve relevant CRL */
853.   		if (ctx->get_crl)
             ^
854.   			ok = ctx->get_crl(ctx, &crl, x);
855.   		else

crypto/x509/x509_vfy.c:856:4: 
854.   			ok = ctx->get_crl(ctx, &crl, x);
855.   		else
856. > 			ok = get_crl_delta(ctx, &crl, &dcrl, x);
857.   		/* If error looking up CRL, nothing we can do except
858.   		 * notify callback

crypto/x509/x509_vfy.c:1448:1: start of procedure get_crl_delta()
  1446.    */
  1447.   	
  1448. > static int get_crl_delta(X509_STORE_CTX *ctx,
  1449.   				X509_CRL **pcrl, X509_CRL **pdcrl, X509 *x)
  1450.   	{

crypto/x509/x509_vfy.c:1452:2: 
  1450.   	{
  1451.   	int ok;
  1452. > 	X509 *issuer = NULL;
  1453.   	int crl_score = 0;
  1454.   	unsigned int reasons;

crypto/x509/x509_vfy.c:1453:2: 
  1451.   	int ok;
  1452.   	X509 *issuer = NULL;
  1453. > 	int crl_score = 0;
  1454.   	unsigned int reasons;
  1455.   	X509_CRL *crl = NULL, *dcrl = NULL;

crypto/x509/x509_vfy.c:1455:2: 
  1453.   	int crl_score = 0;
  1454.   	unsigned int reasons;
  1455. > 	X509_CRL *crl = NULL, *dcrl = NULL;
  1456.   	STACK_OF(X509_CRL) *skcrl;
  1457.   	X509_NAME *nm = X509_get_issuer_name(x);

crypto/x509/x509_vfy.c:1457:2: 
  1455.   	X509_CRL *crl = NULL, *dcrl = NULL;
  1456.   	STACK_OF(X509_CRL) *skcrl;
  1457. > 	X509_NAME *nm = X509_get_issuer_name(x);
  1458.   	reasons = ctx->current_reasons;
  1459.   	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.   
