[Qemu-devel] [Bug 1462944] Re: vpc file causes qemu-img to consume lots of time and memory

[Thomas Huth]

Is there still something left to do here, or could we close this ticket
nowadays?

** Changed in: qemu
       Status: New => Incomplete

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https://bugs.launchpad.net/bugs/1462944

Title:
  vpc file causes qemu-img to consume lots of time and memory

Status in QEMU:
  Incomplete

Bug description:
  The attached vpc file causes 'qemu-img info' to consume 3 or 4 seconds
  of CPU time and 1.3 GB of heap, causing a minor denial of service.

  $ /usr/bin/time ~/d/qemu/qemu-img info afl12.img
  block-vpc: The header checksum of 'afl12.img' is incorrect.
  qemu-img: Could not open 'afl12.img': block-vpc: free_data_block_offset 
points after the end of file. The image has been truncated.
  1.19user 3.15system 0:04.35elapsed 99%CPU (0avgtext+0avgdata 
1324504maxresident)k
  0inputs+0outputs (0major+327314minor)pagefaults 0swaps

  The file was found using american-fuzzy-lop.

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