I believe the fix for Bug#845196 is incomplete, at least in stable. It does ship with this patch:
https://github.com/ImageMagick/ImageMagick/commit/1be809ae06f2fcb094836960edb707f81422e964 but not this one: https://github.com/ImageMagick/ImageMagick/commit/933e96f01a8c889c7bf5ffd30020e86a02a046e7 so it is missing one fputc check in convert. a.
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