On 26.08.19 18:13, Vladimir Sementsov-Ogievskiy wrote: > We shouldn't try to copy bytes beyond EOF. Fix it. > > Signed-off-by: Vladimir Sementsov-Ogievskiy <vsement...@virtuozzo.com> > --- > block/backup.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/block/backup.c b/block/backup.c > index 2baf7bed65..33b144305f 100644 > --- a/block/backup.c > +++ b/block/backup.c > @@ -161,7 +161,7 @@ static int coroutine_fn > backup_cow_with_offload(BackupBlockJob *job, > > assert(QEMU_IS_ALIGNED(job->copy_range_size, job->cluster_size)); > assert(QEMU_IS_ALIGNED(start, job->cluster_size)); > - nbytes = MIN(job->copy_range_size, end - start); > + nbytes = MIN(job->copy_range_size, MIN(end - start, job->len - start));
Might be easier to read as MIN(end, job->len) - start, but either way: Reviewed-by: Max Reitz <mre...@redhat.com> > nr_clusters = DIV_ROUND_UP(nbytes, job->cluster_size); > bdrv_reset_dirty_bitmap(job->copy_bitmap, start, > job->cluster_size * nr_clusters); >
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