FreeBSD: py-pillow -- Integer overflow in Resample.c

The Pillow maintainers report:

If a large value was passed into the new size for an image, it is
possible to overflow an int32 value passed into malloc, leading the
malloc’d buffer to be undersized. These allocations are followed by
a loop that writes out of bounds. This can lead to corruption on
the heap of the Python process with attacker controlled float
data.
This issue was found by Ned Williamson.