tree 6cb381419ba6e1186b7d424875774a541cd0b5ee
parent 26558dbb00e439fb6ea18566361c0671ea6133f5
author Andrew Jeffery <andrew@aj.id.au> 1534168816 +0930
committer Andrew Jeffery <andrew@aj.id.au> 1536730551 +0930

windows: Always allocate a default-size dirty byte map

The current strategy caused memory corruption if windows are down-sized
from the default when a dirty-byte-map reallocation is triggered, as the
code would only allocate a dirty byte map of the current size. When the
window is resized up a gain the dirty byte map buffer is too small, and
we write off the end.

Instead, always allocate a byte map of the default window size which is
the largest the window can be.

Change-Id: I6f8dc414fb26c64e4947d5a19d6b795ead36e180
Signed-off-by: Andrew Jeffery <andrew@aj.id.au>