upstream commit a846738f8c3788d846ed1f587270d2f2e3d32432 ("xen-blkback:
don't leak persistent grants from xen_blkbk_map()")

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https://bugs.launchpad.net/bugs/1921902

Title:
  Security-Fix Xen XSA 371 for Kernel 5.4.0-71

Status in linux package in Ubuntu:
  Confirmed

Bug description:
  Today [XSA 371](http://xenbits.xen.org/xsa/advisory-371.html) was published 
which contain a security patch for a commit which is included in proposed 
5.4.0-71.
  The [Patch](http://xenbits.xen.org/xsa/xsa371-linux.patch) is only 1 line 
maybe you can add this security fix to 5.4.0-71 release.
  Thank you in advance.

  Original Commit:
  XSA-365: xen-blkback: fix error handling in xen_blkbk_map()

  New commit with security fix:
  XSA-371: xen-blkback: don't leak persistent grants from xen_blkbk_map()

  See
  - http://xenbits.xen.org/xsa/advisory-371.html
  - http://xenbits.xen.org/xsa/xsa371-linux.patch
  - http://xenbits.xen.org/xsa/advisory-365.html
  - http://xenbits.xen.org/xsa/xsa365-linux.patch

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