On Wed, May 13, 2015 at 01:12:00PM +0000, Fam Zheng wrote: > For zero write, callers pass in NULL qiov (qemu-io "write -z" or > scsi-disk "write same"). > > Commit fc3959e466 fixed bdrv_co_write_zeroes which is the common case > for this bug, but it still exists in bdrv_aio_write_zeroes. A simpler > fix would be in bdrv_co_do_pwritev which is the NULL dereference point > and covers both cases. > > So don't access it in bdrv_co_do_pwritev in this case, use three aligned > writes. > > Signed-off-by: Fam Zheng <f...@redhat.com> > --- > block/io.c | 97 > ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++-- > 1 file changed, 95 insertions(+), 2 deletions(-)
Reviewed-by: Stefan Hajnoczi <stefa...@redhat.com>
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