[NaCl SDK] nacl_io: Fix use-after-free bug in html5fs

native_client_sdk/src/libraries/nacl_io/passthroughfs/passthrough_fs.cc

Index: native_client_sdk/src/libraries/nacl_io/passthroughfs/passthrough_fs.cc
diff --git a/native_client_sdk/src/libraries/nacl_io/passthroughfs/passthrough_fs.cc b/native_client_sdk/src/libraries/nacl_io/passthroughfs/passthrough_fs.cc
index abee3894e866fab547d9b777c29ce0bbe3b8280e..cf94fee55903bf5f57eb5599787049621c42d7bc 100644
--- a/native_client_sdk/src/libraries/nacl_io/passthroughfs/passthrough_fs.cc
+++ b/native_client_sdk/src/libraries/nacl_io/passthroughfs/passthrough_fs.cc
@@ -26,7 +26,8 @@ Error PassthroughFs::OpenWithMode(const Path& path, int open_flags,
                                   mode_t mode, ScopedNode* out_node) {
   out_node->reset(NULL);
   int real_fd;
-  int error = _real_open(path.Join().c_str(), open_flags, mode, &real_fd);
+  std::string path_str = path.Join();
+  int error = _real_open(path_str.c_str(), open_flags, mode, &real_fd);
   if (error)
     return error;
 
@@ -37,7 +38,8 @@ Error PassthroughFs::OpenWithMode(const Path& path, int open_flags,
 Error PassthroughFs::OpenResource(const Path& path, ScopedNode* out_node) {
   int real_fd;
   out_node->reset(NULL);
-  int error = _real_open_resource(path.Join().c_str(), &real_fd);
+  std::string path_str = path.Join();
+  int error = _real_open_resource(path_str.c_str(), &real_fd);
   if (error)
     return error;
 
@@ -51,11 +53,13 @@ Error PassthroughFs::Unlink(const Path& path) {
 }
 
 Error PassthroughFs::Mkdir(const Path& path, int perm) {
-  return _real_mkdir(path.Join().c_str(), perm);
+  std::string path_str = path.Join();
+  return _real_mkdir(path_str.c_str(), perm);
 }
 
 Error PassthroughFs::Rmdir(const Path& path) {
-  return _real_rmdir(path.Join().c_str());
+  std::string path_str = path.Join();
+  return _real_rmdir(path_str.c_str());
 }
 
 Error PassthroughFs::Remove(const Path& path) {