crypto/x509/x509_vfy.c:554: error: NULL_DEREFERENCE
  pointer `x` last assigned on line 552 could be null and is dereferenced at line 554, column 8.
Showing all 23 steps of the trace


crypto/x509/x509_vfy.c:508:1: start of procedure check_chain_extensions()
506.    */
507.   
508. > static int check_chain_extensions(X509_STORE_CTX *ctx)
509.   {
510.   #ifdef OPENSSL_NO_CHAIN_VERIFY

crypto/x509/x509_vfy.c:513:2: 
511.   	return 1;
512.   #else
513. > 	int i, ok=0, must_be_ca, plen = 0;
514.   	X509 *x;
515.   	int (*cb)(int xok,X509_STORE_CTX *xctx);

crypto/x509/x509_vfy.c:516:2: 
514.   	X509 *x;
515.   	int (*cb)(int xok,X509_STORE_CTX *xctx);
516. > 	int proxy_path_length = 0;
517.   	int purpose;
518.   	int allow_proxy_certs;

crypto/x509/x509_vfy.c:519:2: 
517.   	int purpose;
518.   	int allow_proxy_certs;
519. > 	cb=ctx->verify_cb;
520.   
521.   	/* must_be_ca can have 1 of 3 values:

crypto/x509/x509_vfy.c:529:2: 
527.   	       all certificates in the chain except the leaf certificate.
528.   	*/
529. > 	must_be_ca = -1;
530.   
531.   	/* CRL path validation */

crypto/x509/x509_vfy.c:532:6: Taking false branch
530.   
531.   	/* CRL path validation */
532.   	if (ctx->parent)
            ^
533.   		{
534.   		allow_proxy_certs = 0;

crypto/x509/x509_vfy.c:540:7: Condition is true
538.   		{
539.   		allow_proxy_certs =
540.   			!!(ctx->param->flags & X509_V_FLAG_ALLOW_PROXY_CERTS);
             ^
541.   		/* A hack to keep people who don't want to modify their
542.   		   software happy */

crypto/x509/x509_vfy.c:540:4: 
538.   		{
539.   		allow_proxy_certs =
540. > 			!!(ctx->param->flags & X509_V_FLAG_ALLOW_PROXY_CERTS);
541.   		/* A hack to keep people who don't want to modify their
542.   		   software happy */

crypto/x509/x509_vfy.c:539:3: 
537.   	else
538.   		{
539. > 		allow_proxy_certs =
540.   			!!(ctx->param->flags & X509_V_FLAG_ALLOW_PROXY_CERTS);
541.   		/* A hack to keep people who don't want to modify their

crypto/x509/x509_vfy.c:543:7: Taking false branch
541.   		/* A hack to keep people who don't want to modify their
542.   		   software happy */
543.   		if (getenv("OPENSSL_ALLOW_PROXY_CERTS"))
             ^
544.   			allow_proxy_certs = 1;
545.   		purpose = ctx->param->purpose;

crypto/x509/x509_vfy.c:545:3: 
543.   		if (getenv("OPENSSL_ALLOW_PROXY_CERTS"))
544.   			allow_proxy_certs = 1;
545. > 		purpose = ctx->param->purpose;
546.   		}
547.   

crypto/x509/x509_vfy.c:549:7: 
547.   
548.   	/* Check all untrusted certificates */
549. > 	for (i = 0; i < ctx->last_untrusted; i++)
550.   		{
551.   		int ret;

crypto/x509/x509_vfy.c:549:14: Loop condition is true. Entering loop body
547.   
548.   	/* Check all untrusted certificates */
549.   	for (i = 0; i < ctx->last_untrusted; i++)
                    ^
550.   		{
551.   		int ret;

crypto/x509/x509_vfy.c:552:7: Condition is true
550.   		{
551.   		int ret;
552.   		x = sk_X509_value(ctx->chain, i);
             ^
553.   		if (!(ctx->param->flags & X509_V_FLAG_IGNORE_CRITICAL)
554.   			&& (x->ex_flags & EXFLAG_CRITICAL))

crypto/x509/x509_vfy.c:552:3: 
550.   		{
551.   		int ret;
552. > 		x = sk_X509_value(ctx->chain, i);
553.   		if (!(ctx->param->flags & X509_V_FLAG_IGNORE_CRITICAL)
554.   			&& (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:553:9: Taking true branch
551.   		int ret;
552.   		x = sk_X509_value(ctx->chain, i);
553.   		if (!(ctx->param->flags & X509_V_FLAG_IGNORE_CRITICAL)
               ^
554.   			&& (x->ex_flags & EXFLAG_CRITICAL))
555.   			{

crypto/x509/x509_vfy.c:554:8: 
552.   		x = sk_X509_value(ctx->chain, i);
553.   		if (!(ctx->param->flags & X509_V_FLAG_IGNORE_CRITICAL)
554. > 			&& (x->ex_flags & EXFLAG_CRITICAL))
555.   			{
556.   			ctx->error = X509_V_ERR_UNHANDLED_CRITICAL_EXTENSION;
