From: Douglas Gregor <dgregor@apple.com>
Date: Fri, 5 Apr 2013 20:48:36 +0000 (+0000)
Subject: <rdar://problem/13551789> Fix yet another race in unique_file.
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=0591f19c8b84311288ef19f76952c334b9730681;p=oota-llvm.git

<rdar://problem/13551789> Fix yet another race in unique_file.

If the directory that will contain the unique file doesn't exist when
we tried to create the file, but another process creates it before we
get a chance to try creating it, we would bail out rather than try to
create the unique file.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@178908 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/lib/Support/Unix/PathV2.inc b/lib/Support/Unix/PathV2.inc
index a3dfd4b0a32..7e0aead151b 100644
--- a/lib/Support/Unix/PathV2.inc
+++ b/lib/Support/Unix/PathV2.inc
@@ -430,9 +430,7 @@ rety_open_create:
     if (SavedErrno == errc::file_exists)
       goto retry_random_path;
     // If path prefix doesn't exist, try to create it.
-    if (SavedErrno == errc::no_such_file_or_directory &&
-        !exists(path::parent_path(RandomPath)) &&
-        !TriedToCreateParent) {
+    if (SavedErrno == errc::no_such_file_or_directory && !TriedToCreateParent) {
       TriedToCreateParent = true;
       StringRef p(RandomPath);
       SmallString<64> dir_to_create;