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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 7e4cb74..aba67f6 100644
--- a/block/io.c
+++ b/block/io.c
@@ -1399,7 +1399,7 @@ static int coroutine_fn bdrv_co_do_copy_on_readv(BdrvChild *child,
if (!(flags & BDRV_REQ_PREFETCH)) {
qemu_iovec_from_buf(qiov, qiov_offset + progress,
bounce_buffer + skip_bytes,
- pnum - skip_bytes);
+ MIN(pnum - skip_bytes, bytes - progress));
}
} else if (!(flags & BDRV_REQ_PREFETCH)) {
/* Read directly into the destination */