From c712d68df22e490bc7160cd6a110d03a4a1722ff Mon Sep 17 00:00:00 2001
From: Andrew Murray <radarhere@users.noreply.github.com>
Date: Tue, 6 Jul 2021 11:00:03 +1000
Subject: [PATCH] Catch OSError when checking if fp is sys.stdout

---
 src/PIL/ImageFile.py | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/src/PIL/ImageFile.py b/src/PIL/ImageFile.py
index daf732de1..43d2bf0cc 100644
--- a/src/PIL/ImageFile.py
+++ b/src/PIL/ImageFile.py
@@ -493,7 +493,11 @@ def _save(im, fp, tile, bufsize=0):
     # But, it would need at least the image size in most cases. RawEncode is
     # a tricky case.
     bufsize = max(MAXBLOCK, bufsize, im.size[0] * 4)  # see RawEncode.c
-    if fp == sys.stdout or (hasattr(sys.stdout, "buffer") and fp == sys.stdout.buffer):
+    try:
+        stdout = fp == sys.stdout or fp == sys.stdout.buffer
+    except (OSError, AttributeError):
+        stdout = False
+    if stdout:
         fp.flush()
         return
     try: