diff --git a/reactos/dll/win32/advapi32/crypt/crypt.c b/reactos/dll/win32/advapi32/crypt/crypt.c
index 19b85b7c5d8..d3e3cd578ba 100644
--- a/reactos/dll/win32/advapi32/crypt/crypt.c
+++ b/reactos/dll/win32/advapi32/crypt/crypt.c
@@ -1192,6 +1192,9 @@ BOOL WINAPI CryptEnumProvidersA (DWORD dwIndex, DWORD *pdwReserved,
 	TRACE("(%ld, %p, %08ld, %p, %p, %p)\n", dwIndex, pdwReserved, dwFlags,
 			pdwProvType, pszProvName, pcbProvName);
 
+	if (*pcbProvName > INT_MAX)
+		*pcbProvName = INT_MAX;
+
     if(!CryptEnumProvidersW(dwIndex, pdwReserved, dwFlags, pdwProvType, NULL, &bufsize))
         return FALSE;
 	if ( pszProvName && !(str = CRYPT_Alloc(bufsize)) )
@@ -1314,6 +1317,9 @@ BOOL WINAPI CryptEnumProviderTypesA (DWORD dwIndex, DWORD *pdwReserved,
 	TRACE("(%ld, %p, %08ld, %p, %p, %p)\n", dwIndex, pdwReserved, dwFlags,
 			pdwProvType, pszTypeName, pcbTypeName);
 
+	if (*pcbTypeName > INT_MAX)
+		*pcbTypeName = INT_MAX;
+
 	if(!CryptEnumProviderTypesW(dwIndex, pdwReserved, dwFlags, pdwProvType, NULL, &bufsize))
 		return FALSE;
 	if ( pszTypeName && !(str = CRYPT_Alloc(bufsize)) )
@@ -1513,6 +1519,9 @@ BOOL WINAPI CryptGetDefaultProviderA (DWORD dwProvType, DWORD *pdwReserved,
 
 	TRACE("(%d, %p, %08x, %p, %p)\n", dwProvType, pdwReserved, dwFlags, pszProvName, pcbProvName);
 
+	if (*pcbProvName > INT_MAX)
+		*pcbProvName = INT_MAX;
+
 	CryptGetDefaultProviderW(dwProvType, pdwReserved, dwFlags, NULL, &bufsize);
 	if ( pszProvName && !(str = CRYPT_Alloc(bufsize)) )
 	{