From fb8fe35f63a56170cf1bf92b1991d0056385b901 Mon Sep 17 00:00:00 2001
From: Peter Lieven <pl@kamp.de>
Date: Thu, 24 Oct 2013 09:16:03 +0200
Subject: block/vpc: check that the image has not been truncated

this adds a check that a dynamic VHD file has not been
accidently truncated (e.g. during transfer or upload).

Signed-off-by: Peter Lieven <pl@kamp.de>
Reviewed-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
---
 block/vpc.c | 7 +++++++
 1 file changed, 7 insertions(+)

(limited to 'block')

diff --git a/block/vpc.c b/block/vpc.c
index b5dca3961e..627d11cb9b 100644
--- a/block/vpc.c
+++ b/block/vpc.c
@@ -260,6 +260,13 @@ static int vpc_open(BlockDriverState *bs, QDict *options, int flags,
             }
         }
 
+        if (s->free_data_block_offset > bdrv_getlength(bs->file)) {
+            error_setg(errp, "block-vpc: free_data_block_offset points after "
+                             "the end of file. The image has been truncated.");
+            ret = -EINVAL;
+            goto fail;
+        }
+
         s->last_bitmap_offset = (int64_t) -1;
 
 #ifdef CACHE
-- 
cgit v1.2.3