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[Qemu-stable] [PATCH v12 2/2] block/backup: fix backup_cow_with_offload
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From: |
Vladimir Sementsov-Ogievskiy |
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Subject: |
[Qemu-stable] [PATCH v12 2/2] block/backup: fix backup_cow_with_offload for last cluster |
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Date: |
Tue, 17 Sep 2019 19:07:31 +0300 |
We shouldn't try to copy bytes beyond EOF. Fix it.
Fixes: 9ded4a0114968e
Signed-off-by: Vladimir Sementsov-Ogievskiy <address@hidden>
Reviewed-by: Max Reitz <address@hidden>
---
block/backup.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/block/backup.c b/block/backup.c
index d8fdbfadfe..89f7f89200 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, job->len) - start);
nr_clusters = DIV_ROUND_UP(nbytes, job->cluster_size);
bdrv_reset_dirty_bitmap(job->copy_bitmap, start,
job->cluster_size * nr_clusters);
--
2.21.0