crypto/x509/x509_vfy.c:418: error: NULL_DEREFERENCE
  pointer `x` last assigned on line 416 could be null and is dereferenced at line 418, column 8.
Showing all 20 steps of the trace


crypto/x509/x509_vfy.c:384:1: start of procedure check_chain_extensions()
382.    */
383.   
384. > static int check_chain_extensions(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, must_be_ca;
390.   	X509 *x;
391.   	int (*cb)(int xok,X509_STORE_CTX *xctx);

crypto/x509/x509_vfy.c:392:2: 
390.   	X509 *x;
391.   	int (*cb)(int xok,X509_STORE_CTX *xctx);
392. > 	int proxy_path_length = 0;
393.   	int allow_proxy_certs =
394.   		!!(ctx->param->flags & X509_V_FLAG_ALLOW_PROXY_CERTS);

crypto/x509/x509_vfy.c:394:6: Condition is true
392.   	int proxy_path_length = 0;
393.   	int allow_proxy_certs =
394.   		!!(ctx->param->flags & X509_V_FLAG_ALLOW_PROXY_CERTS);
            ^
395.   	cb=ctx->verify_cb;
396.   

crypto/x509/x509_vfy.c:394:3: 
392.   	int proxy_path_length = 0;
393.   	int allow_proxy_certs =
394. > 		!!(ctx->param->flags & X509_V_FLAG_ALLOW_PROXY_CERTS);
395.   	cb=ctx->verify_cb;
396.   

crypto/x509/x509_vfy.c:393:2: 
391.   	int (*cb)(int xok,X509_STORE_CTX *xctx);
392.   	int proxy_path_length = 0;
393. > 	int allow_proxy_certs =
394.   		!!(ctx->param->flags & X509_V_FLAG_ALLOW_PROXY_CERTS);
395.   	cb=ctx->verify_cb;

crypto/x509/x509_vfy.c:395:2: 
393.   	int allow_proxy_certs =
394.   		!!(ctx->param->flags & X509_V_FLAG_ALLOW_PROXY_CERTS);
395. > 	cb=ctx->verify_cb;
396.   
397.   	/* must_be_ca can have 1 of 3 values:

crypto/x509/x509_vfy.c:405:2: 
403.   	       all certificates in the chain except the leaf certificate.
404.   	*/
405. > 	must_be_ca = -1;
406.   
407.   	/* A hack to keep people who don't want to modify their software

crypto/x509/x509_vfy.c:409:6: Taking false branch
407.   	/* A hack to keep people who don't want to modify their software
408.   	   happy */
409.   	if (getenv("OPENSSL_ALLOW_PROXY_CERTS"))
            ^
410.   		allow_proxy_certs = 1;
411.   

crypto/x509/x509_vfy.c:413:7: 
411.   
412.   	/* Check all untrusted certificates */
413. > 	for (i = 0; i < ctx->last_untrusted; i++)
414.   		{
415.   		int ret;

crypto/x509/x509_vfy.c:413:14: Loop condition is true. Entering loop body
411.   
412.   	/* Check all untrusted certificates */
413.   	for (i = 0; i < ctx->last_untrusted; i++)
                    ^
414.   		{
415.   		int ret;

crypto/x509/x509_vfy.c:416:3: 
414.   		{
415.   		int ret;
416. > 		x = sk_X509_value(ctx->chain, i);
417.   		if (!(ctx->param->flags & X509_V_FLAG_IGNORE_CRITICAL)
418.   			&& (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:417:9: Taking true branch
415.   		int ret;
416.   		x = sk_X509_value(ctx->chain, i);
417.   		if (!(ctx->param->flags & X509_V_FLAG_IGNORE_CRITICAL)
               ^
418.   			&& (x->ex_flags & EXFLAG_CRITICAL))
419.   			{

crypto/x509/x509_vfy.c:418:8: 
416.   		x = sk_X509_value(ctx->chain, i);
417.   		if (!(ctx->param->flags & X509_V_FLAG_IGNORE_CRITICAL)
418. > 			&& (x->ex_flags & EXFLAG_CRITICAL))
419.   			{
420.   			ctx->error = X509_V_ERR_UNHANDLED_CRITICAL_EXTENSION;

static int check_chain_extensions(X509_STORE_CTX *ctx)
{
#ifdef OPENSSL_NO_CHAIN_VERIFY
	return 1;
#else
	int i, ok=0, must_be_ca;
	X509 *x;
	int (*cb)(int xok,X509_STORE_CTX *xctx);
	int proxy_path_length = 0;
	int allow_proxy_certs =
		!!(ctx->param->flags & X509_V_FLAG_ALLOW_PROXY_CERTS);
	cb=ctx->verify_cb;
	must_be_ca = -1;
	if (getenv("OPENSSL_ALLOW_PROXY_CERTS"))
		allow_proxy_certs = 1;
	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;
			}
		if (!allow_proxy_certs && (x->ex_flags & EXFLAG_PROXY))
			{
			ctx->error = X509_V_ERR_PROXY_CERTIFICATES_NOT_ALLOWED;
			ctx->error_depth = i;
			ctx->current_cert = x;
			ok=cb(0,ctx);
			if (!ok) goto end;
			}
		ret = X509_check_ca(x);
		switch(must_be_ca)
			{
		case -1:
			if ((ctx->param->flags & X509_V_FLAG_X509_STRICT)
				&& (ret != 1) && (ret != 0))
				{
				ret = 0;
				ctx->error = X509_V_ERR_INVALID_CA;
				}
			else
				ret = 1;
			break;
		case 0:
			if (ret != 0)
				{
				ret = 0;
				ctx->error = X509_V_ERR_INVALID_NON_CA;
				}
			else
				ret = 1;
			break;
		default:
			if ((ret == 0)
				|| ((ctx->param->flags & X509_V_FLAG_X509_STRICT)
					&& (ret != 1)))
				{
				ret = 0;
				ctx->error = X509_V_ERR_INVALID_CA;
				}
			else
				ret = 1;
			break;
			}
		if (ret == 0)
			{
			ctx->error_depth = i;
			ctx->current_cert = x;
			ok=cb(0,ctx);
			if (!ok) goto end;
			}
		if (ctx->param->purpose > 0)
			{
			ret = X509_check_purpose(x, ctx->param->purpose,
				must_be_ca > 0);
			if ((ret == 0)
				|| ((ctx->param->flags & X509_V_FLAG_X509_STRICT)
					&& (ret != 1)))
				{
				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 + proxy_path_length + 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;
			}
		if (x->ex_flags & EXFLAG_PROXY)
			{
			if (x->ex_pcpathlen != -1 && i > x->ex_pcpathlen)
				{
				ctx->error =
					X509_V_ERR_PROXY_PATH_LENGTH_EXCEEDED;
				ctx->error_depth = i;
				ctx->current_cert = x;
				ok=cb(0,ctx);
				if (!ok) goto end;
				}
			proxy_path_length++;
			must_be_ca = 0;
			}
		else
			must_be_ca = 1;
		}
	ok = 1;
 end:
	return ok;
#endif
}
['static int check_chain_extensions(X509_STORE_CTX *ctx)\n{\n#ifdef OPENSSL_NO_CHAIN_VERIFY\n\treturn 1;\n#else\n\tint i, ok=0, must_be_ca;\n\tX509 *x;\n\tint (*cb)(int xok,X509_STORE_CTX *xctx);\n\tint proxy_path_length = 0;\n\tint allow_proxy_certs =\n\t\t!!(ctx->param->flags & X509_V_FLAG_ALLOW_PROXY_CERTS);\n\tcb=ctx->verify_cb;\n\tmust_be_ca = -1;\n\tif (getenv("OPENSSL_ALLOW_PROXY_CERTS"))\n\t\tallow_proxy_certs = 1;\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\tif (!allow_proxy_certs && (x->ex_flags & EXFLAG_PROXY))\n\t\t\t{\n\t\t\tctx->error = X509_V_ERR_PROXY_CERTIFICATES_NOT_ALLOWED;\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_ca(x);\n\t\tswitch(must_be_ca)\n\t\t\t{\n\t\tcase -1:\n\t\t\tif ((ctx->param->flags & X509_V_FLAG_X509_STRICT)\n\t\t\t\t&& (ret != 1) && (ret != 0))\n\t\t\t\t{\n\t\t\t\tret = 0;\n\t\t\t\tctx->error = X509_V_ERR_INVALID_CA;\n\t\t\t\t}\n\t\t\telse\n\t\t\t\tret = 1;\n\t\t\tbreak;\n\t\tcase 0:\n\t\t\tif (ret != 0)\n\t\t\t\t{\n\t\t\t\tret = 0;\n\t\t\t\tctx->error = X509_V_ERR_INVALID_NON_CA;\n\t\t\t\t}\n\t\t\telse\n\t\t\t\tret = 1;\n\t\t\tbreak;\n\t\tdefault:\n\t\t\tif ((ret == 0)\n\t\t\t\t|| ((ctx->param->flags & X509_V_FLAG_X509_STRICT)\n\t\t\t\t\t&& (ret != 1)))\n\t\t\t\t{\n\t\t\t\tret = 0;\n\t\t\t\tctx->error = X509_V_ERR_INVALID_CA;\n\t\t\t\t}\n\t\t\telse\n\t\t\t\tret = 1;\n\t\t\tbreak;\n\t\t\t}\n\t\tif (ret == 0)\n\t\t\t{\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 (ctx->param->purpose > 0)\n\t\t\t{\n\t\t\tret = X509_check_purpose(x, ctx->param->purpose,\n\t\t\t\tmust_be_ca > 0);\n\t\t\tif ((ret == 0)\n\t\t\t\t|| ((ctx->param->flags & X509_V_FLAG_X509_STRICT)\n\t\t\t\t\t&& (ret != 1)))\n\t\t\t\t{\n\t\t\t\tctx->error = X509_V_ERR_INVALID_PURPOSE;\n\t\t\t\tctx->error_depth = i;\n\t\t\t\tctx->current_cert = x;\n\t\t\t\tok=cb(0,ctx);\n\t\t\t\tif (!ok) goto end;\n\t\t\t\t}\n\t\t\t}\n\t\tif ((i > 1) && (x->ex_pathlen != -1)\n\t\t\t   && (i > (x->ex_pathlen + proxy_path_length + 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\tif (x->ex_flags & EXFLAG_PROXY)\n\t\t\t{\n\t\t\tif (x->ex_pcpathlen != -1 && i > x->ex_pcpathlen)\n\t\t\t\t{\n\t\t\t\tctx->error =\n\t\t\t\t\tX509_V_ERR_PROXY_PATH_LENGTH_EXCEEDED;\n\t\t\t\tctx->error_depth = i;\n\t\t\t\tctx->current_cert = x;\n\t\t\t\tok=cb(0,ctx);\n\t\t\t\tif (!ok) goto end;\n\t\t\t\t}\n\t\t\tproxy_path_length++;\n\t\t\tmust_be_ca = 0;\n\t\t\t}\n\t\telse\n\t\t\tmust_be_ca = 1;\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}']