Handle duplicate exif header

Co-authored-by: Andrew Murray <radarhere@users.noreply.github.com>

Author: radarhere

Tests/test_image.py

@@ -775,6 +775,14 @@ def test_empty_exif(self) -> None:
  exif.load(b"Exif\x00\x00")
  assert not dict(exif)
 
+ def test_duplicate_exif_header(self) -> None:
+ with Image.open("Tests/images/exif.png") as im:
+ im.load()
+ im.info["exif"] = b"Exif\x00\x00" + im.info["exif"]
+
+ exif = im.getexif()
+ assert exif[274] == 1
+
  def test_empty_get_ifd(self) -> None:
  exif = Image.Exif()
  ifd = exif.get_ifd(0x8769)

src/PIL/Image.py

@@ -3968,7 +3968,7 @@ def load(self, data: bytes) -> None:
  self._data.clear()
  self._hidden_data.clear()
  self._ifds.clear()
- if data and data.startswith(b"Exif\x00\x00"):
+ while data and data.startswith(b"Exif\x00\x00"):
  data = data[6:]
  if not data:
  self._info = None