[Qemu-devel] [Bug 1354529] Re: qemu-io: Assert failure on the fuzzed qcow2 image

[Max Reitz]

Hi,

This issue has been fixed in master
(5f77ef69a195098baddfdc6d189f1b4a94587378):

$ ./qemu-io copy.img -c 'write 2856960 208896'
qcow2_free_clusters failed: Invalid argument
qcow2_free_clusters failed: Invalid argument
qcow2_free_clusters failed: Invalid argument
qcow2_free_clusters failed: Invalid argument
qcow2_free_clusters failed: Invalid argument
qcow2_free_clusters failed: File too large
qcow2_free_clusters failed: Invalid argument
qcow2: Image is corrupt: Cannot free unaligned cluster 0xfffffffffffe00; 
further non-fatal corruption events will be suppressed
qcow2_free_clusters failed: Invalid argument
qcow2: Marking image as corrupt: Data cluster offset 0xfffffe00 unaligned 
(guest offset: 0x2e1000); further corruption events will be suppressed
write failed: Input/output error

Thanks for your report (and your fuzzer),

Max

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https://bugs.launchpad.net/bugs/1354529

Title:
  qemu-io: Assert failure on the fuzzed qcow2 image

Status in QEMU:
  Fix Committed

Bug description:
  'qemu-io -c write' failed on the fuzzed image with missed refcount
  tables:

  Sequence:
   1. Unpack the attached archive, make a copy of test.img
   2. Put copy.img and backing_img.cow in the same directory
   3. Execute
     qemu-io copy.img -c 'write 2856960 208896'

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

  qemu-io: block/qcow2-cluster.c:910: handle_copied: Assertion `*host_offset == 
0 
  || offset_into_cluster(s, guest_offset) == offset_into_cluster(s, 
*host_offset)'
   failed.

  qemu.git HEAD 2d591ce2aeebf

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