Re: [Qemu-devel] [PATCH for-2.1 1/2] mirror: Fix qiov size for short requests

[Eric Blake]

On 07/01/2014 08:52 AM, Kevin Wolf wrote:
> When mirroring an image of a size that is not a multiple of the
> mirror job granularity, the last request would have the right nb_sectors
> argument, but a qiov that is rounded up to the next multiple of the
> granularity. Don't do this.
> 
> This fixes a segfault that is caused by raw-posix being confused by this
> and allocating a buffer with request length, but operating on it with
> qiov length.
> 
> Reported-by: Eric Blake <address@hidden>
> Signed-off-by: Kevin Wolf <address@hidden>
> ---
>  block/mirror.c             | 4 +++-
>  tests/qemu-iotests/041     | 5 +++++
>  tests/qemu-iotests/041.out | 4 ++--
>  3 files changed, 10 insertions(+), 3 deletions(-)
> 

> +++ b/tests/qemu-iotests/041
> @@ -219,6 +219,11 @@ class TestSingleDriveZeroLength(TestSingleDrive):
>      test_small_buffer2 = None
>      test_large_cluster = None
>  
> +class TestSingleDriverUnalignedLength(TestSingleDrive):

s/Driver/Drive/ for consistency in the class name?

-- 
Eric Blake   eblake redhat com    +1-919-301-3266
Libvirt virtualization library http://libvirt.org

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