From 349592e0b9112171500e940dd921bb96cfc496d2 Mon Sep 17 00:00:00 2001
From: Jeff Cody <jcody@redhat.com>
Date: Wed, 6 Aug 2014 15:54:57 -0400
Subject: block: vhdx - add error check

This add an error check for an invalid descriptor entry signature,
when flushing the log descriptor entries.

Signed-off-by: Jeff Cody <jcody@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
---
 block/vhdx-log.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/block/vhdx-log.c b/block/vhdx-log.c
index a77c040ee0..7c2630d659 100644
--- a/block/vhdx-log.c
+++ b/block/vhdx-log.c
@@ -435,6 +435,11 @@ static int vhdx_log_flush_desc(BlockDriverState *bs, VHDXLogDescriptor *desc,
         /* write 'count' sectors of sector */
         memset(buffer, 0, VHDX_LOG_SECTOR_SIZE);
         count = desc->zero_length / VHDX_LOG_SECTOR_SIZE;
+    } else {
+        error_report("Invalid VHDX log descriptor entry signature 0x%" PRIx32,
+                      desc->signature);
+        ret = -EINVAL;
+        goto exit;
     }
 
     file_offset = desc->file_offset;
-- 
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