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qemu-io: Failure on a qcow2 image with the fuzzed refcount table
'qemu-io -c write' and 'qemu-io -c aio_write' crashes on a qcow2 image with a fuzzed refcount table.
Sequence:
1. Unpack the attached archive, make a copy of test.img
2. Put copy.img and backing_img.file in the same directory
3. Execute
qemu-io copy.img -c write 279552 322560
or
qemu-io copy.img -c aio_write 836608 166400
Result: qemu-io was killed by SIGIOT with the reason:
qemu-io: block/qcow2-cluster.c:1291: qcow2_alloc_cluster_offset: Assertion `*host_offset != 0' failed.
qemu.git HEAD 69f87f713069f1f
Hi,
this has been fixed in upstream master (5f77ef69a195098baddfdc6d189f1b4a94587378):
$ ./qemu-io copy.img -c 'aio_write 836608 166400'
qcow2: Marking image as corrupt: Preventing invalid write on metadata (overlaps with qcow2_header); further corruption events will be suppressed
aio_write failed: Input/output error
Thanks for your report,
Max
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