From ca02a69fdfb556cb9c8c6d75a29d71b600cbe3c6 Mon Sep 17 00:00:00 2001
From: Wei Liu <liuwe@microsoft.com>
Date: Wed, 16 Nov 2022 21:42:29 +0000
Subject: [PATCH] qcow: add a safety comment

Signed-off-by: Wei Liu <liuwe@microsoft.com>
---
 qcow/src/raw_file.rs | 1 +
 1 file changed, 1 insertion(+)

diff --git a/qcow/src/raw_file.rs b/qcow/src/raw_file.rs
index 886f0481f..620bad182 100644
--- a/qcow/src/raw_file.rs
+++ b/qcow/src/raw_file.rs
@@ -231,6 +231,7 @@ impl Write for RawFile {
                 return Err(io::Error::last_os_error());
             }
 
+            // SAFETY: tmp_ptr is at least rounded_len long
             let tmp_buf = unsafe { slice::from_raw_parts_mut(tmp_ptr, rounded_len) };
 
             // This can eventually replaced with read_at once its interface