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PathV2: Fix a possible infinite loop.

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- The code could infinite loop trying to create unique files, if the directory
   containing the unique file exists, but open() calls on non-existent files in
   the path return ENOENT. This is true on the /dev/fd filesystem, for example.

 - Will add a clang side test case for this.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@168081 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Daniel Dunbar 2012-11-15 20:24:52 +00:00
parent c984657c74
commit 71e5ea8860
1 changed files with 4 additions and 3 deletions
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7
lib/Support/Unix/PathV2.inc
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@ -424,9 +424,10 @@ rety_open_create:
// If the file existed, try again, otherwise, error.
if (errno == errc::file_exists)
goto retry_random_path;
// The path prefix doesn't exist.
if (errno == errc::no_such_file_or_directory) {
StringRef p(RandomPath.begin(), RandomPath.size());
// If path prefix doesn't exist, try to create it.
if (errno == errc::no_such_file_or_directory &&
!exists(path::parent_path(RandomPath))) {
StringRef p(RandomPath);
SmallString<64> dir_to_create;
for (path::const_iterator i = path::begin(p),
e = --path::end(p); i != e; ++i) {