crypto/x509/x509_vfy.c:399: error: NULL_DEREFERENCE
  pointer `x` last assigned on line 397 could be null and is dereferenced at line 399, column 8.
Showing all 14 steps of the trace


crypto/x509/x509_vfy.c:384:1: start of procedure check_chain_purpose()
382.    */
383.   
384. > static int check_chain_purpose(X509_STORE_CTX *ctx)
385.   {
386.   #ifdef OPENSSL_NO_CHAIN_VERIFY

crypto/x509/x509_vfy.c:389:2: 
387.   	return 1;
388.   #else
389. > 	int i, ok=0;
390.   	X509 *x;
391.   	int (*cb)();

crypto/x509/x509_vfy.c:392:2: 
390.   	X509 *x;
391.   	int (*cb)();
392. > 	cb=ctx->verify_cb;
393.   	/* Check all untrusted certificates */
394.   	for (i = 0; i < ctx->last_untrusted; i++)

crypto/x509/x509_vfy.c:394:7: 
392.   	cb=ctx->verify_cb;
393.   	/* Check all untrusted certificates */
394. > 	for (i = 0; i < ctx->last_untrusted; i++)
395.   		{
396.   		int ret;

crypto/x509/x509_vfy.c:394:14: Loop condition is true. Entering loop body
392.   	cb=ctx->verify_cb;
393.   	/* Check all untrusted certificates */
394.   	for (i = 0; i < ctx->last_untrusted; i++)
                    ^
395.   		{
396.   		int ret;

crypto/x509/x509_vfy.c:397:3: 
395.   		{
396.   		int ret;
397. > 		x = sk_X509_value(ctx->chain, i);
398.   		if (!(ctx->param->flags & X509_V_FLAG_IGNORE_CRITICAL)
399.   			&& (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 || (i < 0) || (i >= st->num)) return NULL;

crypto/stack/stack.c:309:6: Taking false branch
  307.   char *sk_value(const STACK *st, int i)
  308.   {
  309.   	if(!st || (i < 0) || (i >= st->num)) return NULL;
              ^
  310.   	return st->data[i];
  311.   }

crypto/stack/stack.c:309:13: Taking false branch
  307.   char *sk_value(const STACK *st, int i)
  308.   {
  309.   	if(!st || (i < 0) || (i >= st->num)) return NULL;
                     ^
  310.   	return st->data[i];
  311.   }

crypto/stack/stack.c:309:24: Taking true branch
  307.   char *sk_value(const STACK *st, int i)
  308.   {
  309.   	if(!st || (i < 0) || (i >= st->num)) return NULL;
                                ^
  310.   	return st->data[i];
  311.   }

crypto/stack/stack.c:309:39: 
  307.   char *sk_value(const STACK *st, int i)
  308.   {
  309. > 	if(!st || (i < 0) || (i >= st->num)) return NULL;
  310.   	return st->data[i];
  311.   }

crypto/stack/stack.c:311:1: return from a call to sk_value
  309.   	if(!st || (i < 0) || (i >= st->num)) return NULL;
  310.   	return st->data[i];
  311. > }
  312.   
  313.   char *sk_set(STACK *st, int i, char *value)

crypto/x509/x509_vfy.c:398:9: Taking true branch
396.   		int ret;
397.   		x = sk_X509_value(ctx->chain, i);
398.   		if (!(ctx->param->flags & X509_V_FLAG_IGNORE_CRITICAL)
               ^
399.   			&& (x->ex_flags & EXFLAG_CRITICAL))
400.   			{

crypto/x509/x509_vfy.c:399:8: 
397.   		x = sk_X509_value(ctx->chain, i);
398.   		if (!(ctx->param->flags & X509_V_FLAG_IGNORE_CRITICAL)
399. > 			&& (x->ex_flags & EXFLAG_CRITICAL))
400.   			{
401.   			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++)
		{
		int ret;
		x = sk_X509_value(ctx->chain, i);
		if (!(ctx->param->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;
			}
		ret = X509_check_purpose(x, ctx->param->purpose, i);
		if ((ret == 0)
			 || ((ctx->param->flags & X509_V_FLAG_X509_STRICT)
				&& (ret != 1)))
			{
			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\tint ret;\n\t\tx = sk_X509_value(ctx->chain, i);\n\t\tif (!(ctx->param->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\tret = X509_check_purpose(x, ctx->param->purpose, i);\n\t\tif ((ret == 0)\n\t\t\t || ((ctx->param->flags & X509_V_FLAG_X509_STRICT)\n\t\t\t\t&& (ret != 1)))\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 || (i < 0) || (i >= st->num)) return NULL;\n\treturn st->data[i];\n}']