crypto/x509/x509_vfy.c:384: error: NULL_DEREFERENCE
  pointer `x` last assigned on line 383 could be null and is dereferenced by call to `X509_check_purpose()` at line 384, column 8.
Showing all 14 steps of the trace


crypto/x509/x509_vfy.c:370:1: start of procedure check_chain_purpose()
368.    */
369.   
370. > static int check_chain_purpose(X509_STORE_CTX *ctx)
371.   {
372.   #ifdef NO_CHAIN_VERIFY

crypto/x509/x509_vfy.c:375:2: 
373.   	return 1;
374.   #else
375. > 	int i, ok=0;
376.   	X509 *x;
377.   	int (*cb)();

crypto/x509/x509_vfy.c:378:2: 
376.   	X509 *x;
377.   	int (*cb)();
378. > 	cb=ctx->verify_cb;
379.   	if (cb == NULL) cb=null_callback;
380.   	/* Check all untrusted certificates */

crypto/x509/x509_vfy.c:379:6: Taking false branch
377.   	int (*cb)();
378.   	cb=ctx->verify_cb;
379.   	if (cb == NULL) cb=null_callback;
            ^
380.   	/* Check all untrusted certificates */
381.   	for (i = 0; i < ctx->last_untrusted; i++)

crypto/x509/x509_vfy.c:381:7: 
379.   	if (cb == NULL) cb=null_callback;
380.   	/* Check all untrusted certificates */
381. > 	for (i = 0; i < ctx->last_untrusted; i++)
382.   		{
383.   		x = sk_X509_value(ctx->chain, i);

crypto/x509/x509_vfy.c:381:14: Loop condition is true. Entering loop body
379.   	if (cb == NULL) cb=null_callback;
380.   	/* Check all untrusted certificates */
381.   	for (i = 0; i < ctx->last_untrusted; i++)
                    ^
382.   		{
383.   		x = sk_X509_value(ctx->chain, i);

crypto/x509/x509_vfy.c:383:3: 
381.   	for (i = 0; i < ctx->last_untrusted; i++)
382.   		{
383. > 		x = sk_X509_value(ctx->chain, i);
384.   		if (!X509_check_purpose(x, ctx->purpose, i))
385.   			{

crypto/stack/stack.c:305:1: start of procedure sk_value()
  303.   }
  304.   
  305. > char *sk_value(const STACK *st, int i)
  306.   {
  307.   	if(st == NULL) return NULL;

crypto/stack/stack.c:307:5: Taking true branch
  305.   char *sk_value(const STACK *st, int i)
  306.   {
  307.   	if(st == NULL) return NULL;
             ^
  308.   	return st->data[i];
  309.   }

crypto/stack/stack.c:307:17: 
  305.   char *sk_value(const STACK *st, int i)
  306.   {
  307. > 	if(st == NULL) return NULL;
  308.   	return st->data[i];
  309.   }

crypto/stack/stack.c:309:1: return from a call to sk_value
  307.   	if(st == NULL) return NULL;
  308.   	return st->data[i];
  309. > }
  310.   
  311.   char *sk_set(STACK *st, int i, char *value)

crypto/x509/x509_vfy.c:384:8: 
382.   		{
383.   		x = sk_X509_value(ctx->chain, i);
384. > 		if (!X509_check_purpose(x, ctx->purpose, i))
385.   			{
386.   			if (i)

crypto/x509v3/v3_purp.c:107:1: start of procedure X509_check_purpose()
  105.    * I really can't because it does recalculate hashes and do other non-const
  106.    * things. */
  107. > int X509_check_purpose(X509 *x, int id, int ca)
  108.   {
  109.   	int idx;

crypto/x509v3/v3_purp.c:111:7: 
  109.   	int idx;
  110.   	const X509_PURPOSE *pt;
  111. > 	if(!(x->ex_flags & EXFLAG_SET)) {
  112.   		CRYPTO_w_lock(CRYPTO_LOCK_X509);
  113.   		x509v3_cache_extensions(x);
