From aa9ecac0328a7dce7d7f3bd3d0ee7a9ec0316f83 Mon Sep 17 00:00:00 2001
From: Andrew Murray <radarhere@users.noreply.github.com>
Date: Sat, 1 Apr 2023 10:27:39 +1100
Subject: [PATCH] Added ImageSourceData to TAGS_V2

---
 Tests/test_file_libtiff.py  |  5 +++++
 docs/releasenotes/9.5.0.rst | 10 +++++++++-
 src/PIL/TiffTags.py         |  1 +
 3 files changed, 15 insertions(+), 1 deletion(-)

diff --git a/Tests/test_file_libtiff.py b/Tests/test_file_libtiff.py
index 7a94c0302f9..53cfd81f702 100644
--- a/Tests/test_file_libtiff.py
+++ b/Tests/test_file_libtiff.py
@@ -668,6 +668,11 @@ def test_save_ycbcr(self, tmp_path):
             assert reloaded.tag_v2[530] == (1, 1)
             assert reloaded.tag_v2[532] == (0, 255, 128, 255, 128, 255)
 
+    def test_save_imagesourcedata(self, tmp_path):
+        outfile = str(tmp_path / "temp.tif")
+        with Image.open("Tests/images/tiff_adobe_deflate.tif") as im:
+            im.save(outfile)
+
     def test_crashing_metadata(self, tmp_path):
         # issue 1597
         with Image.open("Tests/images/rdf.tif") as im:
diff --git a/docs/releasenotes/9.5.0.rst b/docs/releasenotes/9.5.0.rst
index 1ba9b98905b..9157210827c 100644
--- a/docs/releasenotes/9.5.0.rst
+++ b/docs/releasenotes/9.5.0.rst
@@ -72,10 +72,18 @@ data to populate those resources.
 PpmImagePlugin might hold onto the last data read for a pixel value in case the
 pixel value has not been finished yet. However, that data was not being cleared
 afterwards, meaning that infinite data could be available to fill any image
-size.
+size. This has been present since Pillow 9.2.0.
 
 That data is now cleared after use.
 
+Saving TIFF tag ImageSourceData
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+If Pillow incorrectly saved the TIFF tag ImageSourceData as ASCII instead of
+UNDEFINED, a segmentation fault was triggered.
+
+The correct tag type will now be used by default instead.
+
 Other Changes
 =============
 
diff --git a/src/PIL/TiffTags.py b/src/PIL/TiffTags.py
index ac048ba562f..30b05e4e1d4 100644
--- a/src/PIL/TiffTags.py
+++ b/src/PIL/TiffTags.py
@@ -195,6 +195,7 @@ def lookup(tag, group=None):
     34675: ("ICCProfile", UNDEFINED, 1),
     34853: ("GPSInfoIFD", LONG, 1),
     36864: ("ExifVersion", UNDEFINED, 1),
+    37724: ("ImageSourceData", UNDEFINED, 1),
     40965: ("InteroperabilityIFD", LONG, 1),
     41730: ("CFAPattern", UNDEFINED, 1),
     # MPInfo