Width and height are unsigned

Author: radarhere

src/PIL/GbrImagePlugin.py

@@ -54,7 +54,7 @@ def _open(self) -> None:
         width = i32(self.fp.read(4))
         height = i32(self.fp.read(4))
         color_depth = i32(self.fp.read(4))
-        if width <= 0 or height <= 0:
+        if width == 0 or height == 0:
             msg = "not a GIMP brush"
             raise SyntaxError(msg)
         if color_depth not in (1, 4):
@@ -71,7 +71,7 @@ def _open(self) -> None:
                 raise SyntaxError(msg)
             self.info["spacing"] = i32(self.fp.read(4))
 
-        comment = self.fp.read(comment_length)[:-1]
+        self.info["comment"] = self.fp.read(comment_length)[:-1]
 
         if color_depth == 1:
             self._mode = "L"
@@ -80,8 +80,6 @@ def _open(self) -> None:
 
         self._size = width, height
 
-        self.info["comment"] = comment
-
         # Image might not be small
         Image._decompression_bomb_check(self.size)