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[Qemu-block] [PATCH 1/3] qcow2: Fix unaligned preallocated truncation
From: |
Max Reitz |
Subject: |
[Qemu-block] [PATCH 1/3] qcow2: Fix unaligned preallocated truncation |
Date: |
Mon, 9 Oct 2017 23:55:31 +0200 |
A qcow2 image file's length is not required to have a length that is a
multiple of the cluster size. However, qcow2_refcount_area() expects an
aligned value for its @start_offset parameter, so we need to round
@old_file_size up to the next cluster boundary.
Reported-by: pingl <address@hidden>
Bug: https://bugzilla.redhat.com/show_bug.cgi?id=1414049
Signed-off-by: Max Reitz <address@hidden>
---
block/qcow2.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/block/qcow2.c b/block/qcow2.c
index 2f6a8e1ff8..c3b312cdef 100644
--- a/block/qcow2.c
+++ b/block/qcow2.c
@@ -3193,6 +3193,7 @@ static int qcow2_truncate(BlockDriverState *bs, int64_t
offset,
"Failed to inquire current file length");
return old_file_size;
}
+ old_file_size = ROUND_UP(old_file_size, s->cluster_size);
nb_new_data_clusters = DIV_ROUND_UP(offset - old_length,
s->cluster_size);
--
2.13.6