[issue7673] audioop: check that length is a multiple of the size

[STINNER Victor]

STINNER Victor <victor.stinner at haypocalc.com> added the comment:

@Mark: Here is the updated version of the patch including all of your remarks. I fixed 3 bugs in my patch: the checks of adpcm2lin(), alaw2lin() and audioop.ulaw2lin() were incomplete (len was not checked).

I added 3.1 to the version field.

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versions: +Python 3.1
Added file: http://bugs.python.org/file17823/audioop_check_length-2.patch

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