Hi!

Just to publicly scribble down my notes so far:

* The patch from IM upstream relies on bytes_per_line*depth not
  overflowing. Need to check whether XShmCreateImage() indeed provides
  us with such a guarrantee. (And if there is, does
  bytes_per_line*height indeed present a problem?)
* Likewise, GM 1.3.5 already has code in place to prevent the second of
  the three overflows fixed in the original patch, but relies on the
  same assumptions.
* A test case would be great.

Daniel.




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