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-rw-r--r--block/io.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/block/io.c b/block/io.c
index 80d6c62a85..40bd94f323 100644
--- a/block/io.c
+++ b/block/io.c
@@ -1444,7 +1444,7 @@ static int coroutine_fn bdrv_co_do_zero_pwritev(BdrvChild *child,
     int ret = 0;
 
     head_padding_bytes = offset & (align - 1);
-    tail_padding_bytes = align - ((offset + bytes) & (align - 1));
+    tail_padding_bytes = (align - (offset + bytes)) & (align - 1);
 
 
     assert(flags & BDRV_REQ_ZERO_WRITE);