[Qemu-devel] [PATCH] block/vpc: check that the image has not been truncated

[Peter Lieven <pl@kamp.de>]

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>
---
 block/vpc.c |    7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/block/vpc.c b/block/vpc.c
index 1acc1d4..921364e 100644
--- a/block/vpc.c
+++ b/block/vpc.c
@@ -269,6 +269,13 @@ static int vpc_open(BlockDriverState *bs, QDict *options, int flags,
             }
         }
 
+        if (s->free_data_block_offset > bdrv_getlength(bs->file)) {
+            ret = -EINVAL;
+            fprintf(stderr, "block-vpc: free_data_block_offset points after"
+                            "the end of file. the image has been truncated.\n");
+            goto fail;
+        }
+
         s->last_bitmap_offset = (int64_t) -1;
 
 #ifdef CACHE
-- 
1.7.9.5