[wp-trac] [WordPress Trac] #40085: Audio/video uploads are broken in 4.2.13 and 4.3.9

[WordPress Trac]

#40085: Audio/video uploads are broken in 4.2.13 and 4.3.9
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 Reporter:  uzegonemad    |      Owner:
     Type:  defect (bug)  |     Status:  new
 Priority:  normal        |  Milestone:  Awaiting Review
Component:  Media         |    Version:  trunk
 Severity:  normal        |   Keywords:
  Focuses:                |
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 As the title states, audio/video uploads are broken in the 4.2.13 and
 4.3.9 security releases.

 These releases backport a function for validating metadata,
 `wp_kses_post_deep`, but this function wasn't introduced until 4.4.

 Uploading an audio/video file will respond with an undefined function
 error.

 Relevant 4.2 commit:
 https://core.trac.wordpress.org/changeset/40148

 Relevant 4.3 commit:
 https://core.trac.wordpress.org/changeset/40153

 Trac doesn't let me choose 4.2.13, so I've filed this against trunk.

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Ticket URL: <https://core.trac.wordpress.org/ticket/40085>
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