Add extra checks to avoid infinite loop

ianare · May 2, 2023 · 2fee474 · 2fee474
1 parent 32e93ce
commit 2fee474
Showing 1 changed file with 2 additions and 0 deletions.
diff --git a/exifread/classes.py b/exifread/classes.py
@@ -97,6 +97,8 @@ def s2n(self, offset, length: int, signed=False) -> int:
             raise ValueError('unexpected unpacking length: %d' % length) from err
         self.file_handle.seek(self.offset + offset)
         buf = self.file_handle.read(length)
+        if len(buf) != length:
+            raise ValueError("cannot read enough bytes, something elsewhere is wrong")
 
         if buf:
             # https://github.com/ianare/exif-py/pull/158