diff mbox

[v2,1/5] vpc: Check failure of bdrv_getlength()

Message ID 20170809203808.31725-2-eblake@redhat.com
State New
Headers show

Commit Message

Eric Blake Aug. 9, 2017, 8:38 p.m. UTC 
vpc_open() was checking for bdrv_getlength() failure in one, but
not the other, location.

Reported-by: Markus Armbruster <armbru@redhat.com>
Signed-off-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Reviewed-by: Jeff Cody <jcody@redhat.com>
Reviewed-by: John Snow <jsnow@redhat.com>

---
v2: error message tweak [Kevin]
---
 block/vpc.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)
diff mbox

Patch

diff --git a/block/vpc.c b/block/vpc.c
index 574879ba7c..82911ebead 100644
--- a/block/vpc.c
+++ b/block/vpc.c
@@ -219,6 +219,7 @@  static int vpc_open(BlockDriverState *bs, QDict *options, int flags,
     uint64_t pagetable_size;
     int disk_type = VHD_DYNAMIC;
     int ret;
+    int64_t bs_size;

     bs->file = bdrv_open_child(NULL, options, "file", bs, &child_file,
                                false, errp);
@@ -411,7 +412,13 @@  static int vpc_open(BlockDriverState *bs, QDict *options, int flags,
             }
         }

-        if (s->free_data_block_offset > bdrv_getlength(bs->file->bs)) {
+        bs_size = bdrv_getlength(bs->file->bs);
+        if (bs_size < 0) {
+            error_setg_errno(errp, -bs_size, "Unable to learn image size");
+            ret = bs_size;
+            goto fail;
+        }
+        if (s->free_data_block_offset > bs_size) {
             error_setg(errp, "block-vpc: free_data_block_offset points after "
                              "the end of file. The image has been truncated.");
             ret = -EINVAL;