crypto/x509/x509_vfy.c:588: error: NULL_DEREFERENCE
  pointer `x` last assigned on line 578 could be null and is dereferenced at line 588, column 30.
Showing all 24 steps of the trace


crypto/x509/x509_vfy.c:534:1: start of procedure check_chain_extensions()
532.    */
533.   
534. > static int check_chain_extensions(X509_STORE_CTX *ctx)
535.   {
536.   #ifdef OPENSSL_NO_CHAIN_VERIFY

crypto/x509/x509_vfy.c:539:2: 
537.   	return 1;
538.   #else
539. > 	int i, ok=0, must_be_ca, plen = 0;
540.   	X509 *x;
541.   	int (*cb)(int xok,X509_STORE_CTX *xctx);

crypto/x509/x509_vfy.c:542:2: 
540.   	X509 *x;
541.   	int (*cb)(int xok,X509_STORE_CTX *xctx);
542. > 	int proxy_path_length = 0;
543.   	int purpose;
544.   	int allow_proxy_certs;

crypto/x509/x509_vfy.c:545:2: 
543.   	int purpose;
544.   	int allow_proxy_certs;
545. > 	cb=ctx->verify_cb;
546.   
547.   	/* must_be_ca can have 1 of 3 values:

crypto/x509/x509_vfy.c:555:2: 
553.   	       all certificates in the chain except the leaf certificate.
554.   	*/
555. > 	must_be_ca = -1;
556.   
557.   	/* CRL path validation */

crypto/x509/x509_vfy.c:558:6: Taking false branch
556.   
557.   	/* CRL path validation */
558.   	if (ctx->parent)
            ^
559.   		{
560.   		allow_proxy_certs = 0;

crypto/x509/x509_vfy.c:566:7: Condition is true
564.   		{
565.   		allow_proxy_certs =
566.   			!!(ctx->param->flags & X509_V_FLAG_ALLOW_PROXY_CERTS);
             ^
567.   		/* A hack to keep people who don't want to modify their
568.   		   software happy */

crypto/x509/x509_vfy.c:566:4: 
564.   		{
565.   		allow_proxy_certs =
566. > 			!!(ctx->param->flags & X509_V_FLAG_ALLOW_PROXY_CERTS);
567.   		/* A hack to keep people who don't want to modify their
568.   		   software happy */

crypto/x509/x509_vfy.c:565:3: 
563.   	else
564.   		{
565. > 		allow_proxy_certs =
566.   			!!(ctx->param->flags & X509_V_FLAG_ALLOW_PROXY_CERTS);
567.   		/* A hack to keep people who don't want to modify their

crypto/x509/x509_vfy.c:569:7: Taking false branch
567.   		/* A hack to keep people who don't want to modify their
568.   		   software happy */
569.   		if (getenv("OPENSSL_ALLOW_PROXY_CERTS"))
             ^
570.   			allow_proxy_certs = 1;
571.   		purpose = ctx->param->purpose;

crypto/x509/x509_vfy.c:571:3: 
569.   		if (getenv("OPENSSL_ALLOW_PROXY_CERTS"))
570.   			allow_proxy_certs = 1;
571. > 		purpose = ctx->param->purpose;
572.   		}
573.   

crypto/x509/x509_vfy.c:575:7: 
573.   
574.   	/* Check all untrusted certificates */
575. > 	for (i = 0; i < ctx->last_untrusted; i++)
576.   		{
577.   		int ret;

crypto/x509/x509_vfy.c:575:14: Loop condition is true. Entering loop body
573.   
574.   	/* Check all untrusted certificates */
575.   	for (i = 0; i < ctx->last_untrusted; i++)
                    ^
576.   		{
577.   		int ret;

crypto/x509/x509_vfy.c:578:7: Condition is true
576.   		{
577.   		int ret;
578.   		x = sk_X509_value(ctx->chain, i);
             ^
579.   		if (!(ctx->param->flags & X509_V_FLAG_IGNORE_CRITICAL)
580.   			&& (x->ex_flags & EXFLAG_CRITICAL))

crypto/x509/x509_vfy.c:578:3: 
576.   		{
577.   		int ret;
578. > 		x = sk_X509_value(ctx->chain, i);
579.   		if (!(ctx->param->flags & X509_V_FLAG_IGNORE_CRITICAL)
580.   			&& (x->ex_flags & EXFLAG_CRITICAL))

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:579:9: Taking false branch
577.   		int ret;
578.   		x = sk_X509_value(ctx->chain, i);
579.   		if (!(ctx->param->flags & X509_V_FLAG_IGNORE_CRITICAL)
               ^
580.   			&& (x->ex_flags & EXFLAG_CRITICAL))
581.   			{

crypto/x509/x509_vfy.c:588:8: Taking true branch
586.   			if (!ok) goto end;
587.   			}
588.   		if (!allow_proxy_certs && (x->ex_flags & EXFLAG_PROXY))
              ^
589.   			{
590.   			ctx->error = X509_V_ERR_PROXY_CERTIFICATES_NOT_ALLOWED;

crypto/x509/x509_vfy.c:588:30: 
586.   			if (!ok) goto end;
587.   			}
588. > 		if (!allow_proxy_certs && (x->ex_flags & EXFLAG_PROXY))
589.   			{
590.   			ctx->error = X509_V_ERR_PROXY_CERTIFICATES_NOT_ALLOWED;
