commit 349592e0b9112171500e940dd921bb96cfc496d2
author Jeff Cody <jcody@redhat.com> Wed Aug 06 15:54:57 2014 -0400
committer Kevin Wolf <kwolf@redhat.com> Fri Aug 15 15:07:14 2014 +0200
tree fc521a4cc799741538614d28e11972f12f030d2e
parent 3c80ca158c96ff902a30883a8933e755988948b1

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

diff --git a/block/vhdx-log.c b/block/vhdx-log.c
index a77c040..7c2630d 100644
--- a/block/vhdx-log.c
+++ b/block/vhdx-log.c
@@ -435,6 +435,11 @@
         /* 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;