Fix race condition in create_stdio()

Issue #24891: Fix a race condition at Python startup if the file descriptor
of stdin (0), stdout (1) or stderr (2) is closed while Python is creating
sys.stdin, sys.stdout and sys.stderr objects. These attributes are now set
to None if the creation of the object failed, instead of raising an OSError
exception. Initial patch written by Marco Paolini.

2 files changed, 7 insertions, 0 deletions

diff --git a/Misc/ACKS b/Misc/ACKS
index 9af7c98..948e542 100644
--- a/Misc/ACKS
+++ b/Misc/ACKS
@@ -1037,6 +1037,7 @@ Jan Palus
 Yongzhi Pan
 Martin Panter
 Mathias Panzenböck
+Marco Paolini
 M. Papillon
 Peter Parente
 Alexandre Parenteau
diff --git a/Misc/NEWS b/Misc/NEWS
index 0204090..66780ed 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -10,6 +10,12 @@ Release date: tba
 Core and Builtins
 -----------------
 
+- Issue #24891: Fix a race condition at Python startup if the file descriptor
+  of stdin (0), stdout (1) or stderr (2) is closed while Python is creating
+  sys.stdin, sys.stdout and sys.stderr objects. These attributes are now set
+  to None if the creation of the object failed, instead of raising an OSError
+  exception. Initial patch written by Marco Paolini.
+
 - Issue #21167: NAN operations are now handled correctly when python is
   compiled with ICC even if -fp-model strict is not specified.