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qemu-patch-raspberry4
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block/backup: fix backup_cow_with_offload for last cluster 

We shouldn't try to copy bytes beyond EOF. Fix it.

Fixes: 9ded4a0114
Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
Reviewed-by: John Snow <jsnow@redhat.com>
Message-id: 20190920142056.12778-3-vsementsov@virtuozzo.com
Signed-off-by: Max Reitz <mreitz@redhat.com>
(cherry picked from commit 1048ddf0a3)
Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>
stable-4.1
Vladimir Sementsov-Ogievskiy 2019-09-20 17:20:43 +03:00 committed by Michael Roth
parent e01ed1a1ae
commit 783e7eb52c
1 changed files with 1 additions and 1 deletions
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block/backup.c
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@ -167,7 +167,7 @@ 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, job->len) - start);
nr_clusters = DIV_ROUND_UP(nbytes, job->cluster_size);
hbitmap_reset(job->copy_bitmap, start, job->cluster_size * nr_clusters);
ret = blk_co_copy_range(blk, start, job->target, start, nbytes,