[Qemu-devel] [Bug 1357440] Re: qemu-img: Assert for 'amend' command and the fuzzed image

[Max Reitz]

Hi,

This issue should be fixed by my "[PATCH v3 0/7] block/qcow2: Improve
zero cluster expansion" series.

However, there are similar issues in qemu, so we'll probably need a
function to quickly mark an image corrupt instead of throwing these
assertions.

Max

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https://bugs.launchpad.net/bugs/1357440

Title:
  qemu-img: Assert for 'amend' command and the fuzzed image

Status in QEMU:
  New

Bug description:
  'qemu-img amend' failed with the assert on the fuzzed image.

  Sequence:
   1. Unpack the attached archive, make a copy of test.img
   2. Put copy.img and backing_img.vdi in the same directory
   3. Execute
     qemu-img amend -o compat=0.10 -f qcow2 copy.img

  Result: qemu-img was killed by SIGIOT with the reason:

  qemu-img: block/qcow2-cluster.c:1598: expand_zero_clusters_in_l1:
  Assertion `(cluster_index >= 0) && (cluster_index < *nb_clusters)'
  failed.

  qemu.git HEAD 2d591ce2aeebf

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