crypto/x509/x509_vfy.c:388: error: NULL_DEREFERENCE
  pointer `x` last assigned on line 386 could be null and is dereferenced at line 388, column 8.
Showing all 12 steps of the trace


crypto/x509/x509_vfy.c:374:1: start of procedure check_chain_purpose()
372.    */
373.   
374. > static int check_chain_purpose(X509_STORE_CTX *ctx)
375.   {
376.   #ifdef OPENSSL_NO_CHAIN_VERIFY

crypto/x509/x509_vfy.c:379:2: 
377.   	return 1;
378.   #else
379. > 	int i, ok=0;
380.   	X509 *x;
381.   	int (*cb)();

crypto/x509/x509_vfy.c:382:2: 
380.   	X509 *x;
381.   	int (*cb)();
382. > 	cb=ctx->verify_cb;
383.   	/* Check all untrusted certificates */
384.   	for (i = 0; i < ctx->last_untrusted; i++)

crypto/x509/x509_vfy.c:384:7: 
382.   	cb=ctx->verify_cb;
383.   	/* Check all untrusted certificates */
384. > 	for (i = 0; i < ctx->last_untrusted; i++)
385.   		{
386.   		x = sk_X509_value(ctx->chain, i);

crypto/x509/x509_vfy.c:384:14: Loop condition is true. Entering loop body
382.   	cb=ctx->verify_cb;
383.   	/* Check all untrusted certificates */
384.   	for (i = 0; i < ctx->last_untrusted; i++)
                    ^
385.   		{
386.   		x = sk_X509_value(ctx->chain, i);

crypto/x509/x509_vfy.c:386:3: 
384.   	for (i = 0; i < ctx->last_untrusted; i++)
385.   		{
386. > 		x = sk_X509_value(ctx->chain, i);
387.   		if (!(ctx->flags & X509_V_FLAG_IGNORE_CRITICAL)
388.   			&& (x->ex_flags & EXFLAG_CRITICAL))

crypto/stack/stack.c:307:1: start of procedure sk_value()
  305.   }
  306.   
  307. > char *sk_value(const STACK *st, int i)
  308.   {
  309.   	if(st == NULL) return NULL;

crypto/stack/stack.c:309:5: Taking true branch
  307.   char *sk_value(const STACK *st, int i)
  308.   {
  309.   	if(st == NULL) return NULL;
             ^
  310.   	return st->data[i];
  311.   }

crypto/stack/stack.c:309:17: 
  307.   char *sk_value(const STACK *st, int i)
  308.   {
  309. > 	if(st == NULL) return NULL;
  310.   	return st->data[i];
  311.   }

crypto/stack/stack.c:311:1: return from a call to sk_value
  309.   	if(st == NULL) return NULL;
  310.   	return st->data[i];
  311. > }
  312.   
  313.   char *sk_set(STACK *st, int i, char *value)

crypto/x509/x509_vfy.c:387:9: Taking true branch
385.   		{
386.   		x = sk_X509_value(ctx->chain, i);
387.   		if (!(ctx->flags & X509_V_FLAG_IGNORE_CRITICAL)
               ^
388.   			&& (x->ex_flags & EXFLAG_CRITICAL))
389.   			{

crypto/x509/x509_vfy.c:388:8: 
386.   		x = sk_X509_value(ctx->chain, i);
387.   		if (!(ctx->flags & X509_V_FLAG_IGNORE_CRITICAL)
388. > 			&& (x->ex_flags & EXFLAG_CRITICAL))
389.   			{
390.   			ctx->error = X509_V_ERR_UNHANDLED_CRITICAL_EXTENSION;

static int check_chain_purpose(X509_STORE_CTX *ctx)
{
#ifdef OPENSSL_NO_CHAIN_VERIFY
	return 1;
#else
	int i, ok=0;
	X509 *x;
	int (*cb)();
	cb=ctx->verify_cb;
	for (i = 0; i < ctx->last_untrusted; i++)
		{
		x = sk_X509_value(ctx->chain, i);
		if (!(ctx->flags & X509_V_FLAG_IGNORE_CRITICAL)
			&& (x->ex_flags & EXFLAG_CRITICAL))
			{
			ctx->error = X509_V_ERR_UNHANDLED_CRITICAL_EXTENSION;
			ctx->error_depth = i;
			ctx->current_cert = x;
			ok=cb(0,ctx);
			if (!ok) goto end;
			}
		if (!X509_check_purpose(x, ctx->purpose, i))
			{
			if (i)
				ctx->error = X509_V_ERR_INVALID_CA;
			else
				ctx->error = X509_V_ERR_INVALID_PURPOSE;
			ctx->error_depth = i;
			ctx->current_cert = x;
			ok=cb(0,ctx);
			if (!ok) goto end;
			}
		if ((i > 1) && (x->ex_pathlen != -1)
			   && (i > (x->ex_pathlen + 1)))
			{
			ctx->error = X509_V_ERR_PATH_LENGTH_EXCEEDED;
			ctx->error_depth = i;
			ctx->current_cert = x;
			ok=cb(0,ctx);
			if (!ok) goto end;
			}
		}
	ok = 1;
 end:
	return ok;
#endif
}
['static int check_chain_purpose(X509_STORE_CTX *ctx)\n{\n#ifdef OPENSSL_NO_CHAIN_VERIFY\n\treturn 1;\n#else\n\tint i, ok=0;\n\tX509 *x;\n\tint (*cb)();\n\tcb=ctx->verify_cb;\n\tfor (i = 0; i < ctx->last_untrusted; i++)\n\t\t{\n\t\tx = sk_X509_value(ctx->chain, i);\n\t\tif (!(ctx->flags & X509_V_FLAG_IGNORE_CRITICAL)\n\t\t\t&& (x->ex_flags & EXFLAG_CRITICAL))\n\t\t\t{\n\t\t\tctx->error = X509_V_ERR_UNHANDLED_CRITICAL_EXTENSION;\n\t\t\tctx->error_depth = i;\n\t\t\tctx->current_cert = x;\n\t\t\tok=cb(0,ctx);\n\t\t\tif (!ok) goto end;\n\t\t\t}\n\t\tif (!X509_check_purpose(x, ctx->purpose, i))\n\t\t\t{\n\t\t\tif (i)\n\t\t\t\tctx->error = X509_V_ERR_INVALID_CA;\n\t\t\telse\n\t\t\t\tctx->error = X509_V_ERR_INVALID_PURPOSE;\n\t\t\tctx->error_depth = i;\n\t\t\tctx->current_cert = x;\n\t\t\tok=cb(0,ctx);\n\t\t\tif (!ok) goto end;\n\t\t\t}\n\t\tif ((i > 1) && (x->ex_pathlen != -1)\n\t\t\t   && (i > (x->ex_pathlen + 1)))\n\t\t\t{\n\t\t\tctx->error = X509_V_ERR_PATH_LENGTH_EXCEEDED;\n\t\t\tctx->error_depth = i;\n\t\t\tctx->current_cert = x;\n\t\t\tok=cb(0,ctx);\n\t\t\tif (!ok) goto end;\n\t\t\t}\n\t\t}\n\tok = 1;\n end:\n\treturn ok;\n#endif\n}', 'char *sk_value(const STACK *st, int i)\n{\n\tif(st == NULL) return NULL;\n\treturn st->data[i];\n}']