From 0cf92e82162051beffb11c230740f11bc02a104a Mon Sep 17 00:00:00 2001
From: Andrei Karas <akaras@inbox.ru>
Date: Sat, 4 Aug 2018 01:49:22 +0300
Subject: Add possible workaround for realpath overflow.

---
 src/fs/paths.cpp | 15 +++++++++++----
 1 file changed, 11 insertions(+), 4 deletions(-)

(limited to 'src/fs/paths.cpp')

diff --git a/src/fs/paths.cpp b/src/fs/paths.cpp
index db9742daf..c13bdd966 100644
--- a/src/fs/paths.cpp
+++ b/src/fs/paths.cpp
@@ -38,17 +38,18 @@
 #endif  // USE_X11
 
 #ifdef __native_client__
-#include <limits.h>
 #define realpath(N, R) strcpy(R, N)
 #endif  // __native_client__
 
 #ifdef WIN32
 #include "fs/specialfolder.h"
 #define realpath(N, R) _fullpath((R), (N), _MAX_PATH)
-#elif defined __OpenBSD__
+#endif
+
+#if defined __OpenBSD__
 #include <limits>
-#elif defined __native_client__
-#include <limits.h>
+#else
+#include <climits>
 #endif  // WIN32
 
 #ifndef WIN32
@@ -79,6 +80,12 @@ std::string getRealPath(const std::string &str)
     if (str.find("(unreachable)") != std::string::npos)
         return "";
 #endif  // defined(__GLIBC__)
+
+    // possible fix for realpath overflow
+    if (str.size() > SSIZE_MAX / 10)
+    {
+        return std::string();
+    }
 #if defined(__OpenBSD__) || defined(__ANDROID__) || defined(__native_client__)
     char *realPath = reinterpret_cast<char*>(calloc(PATH_MAX, sizeof(char)));
     if (!realPath)
-- 
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