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[Colin Ian King <1429804@xxxxxxxxxxxxxxxxxx>]

SRU Justification:

[Impact]
Running a btrfs test I trip a NULL pointer dereference

[Fix]
clean upstream cherry pick 755f780865221252ef3321215c9796b78e7b1c5 ("btrfs: fix null pointer dereference in clone_fs_devices when name is null")

[Testcase]
See attached hacked up bash script.btrfs:  Without the fix I can reproduce the oops every time. With the fix, it works perfectly.

** Attachment added: "lp-1429804.sh"
   https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1429804/+attachment/4338748/+files/lp-1429804.sh

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Title:
  [trusty] btrfs kernel NULL pointer dereference while exercising test
  for commit 0aeb8a6e67cddeac1d42cf64795fde0641a1cffb

Status in linux package in Ubuntu:
  In Progress

Bug description:
  While exercising a test for commit
  0aeb8a6e67cddeac1d42cf64795fde0641a1cffb I hit a null pointer
  dereference bug.  The fix for this is commit:

  From e755f780865221252ef3321215c9796b78e7b1c5 Mon Sep 17 00:00:00 2001
  From: Anand Jain <Anand.Jain@xxxxxxxxxx>
  Date: Mon, 30 Jun 2014 17:12:47 +0800
  Subject: [PATCH] btrfs: fix null pointer dereference in clone_fs_devices when
   name is null

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