[Qemu-devel] [PATCH 3/6] qcow2: Catch bdrv_getlength() error

[Max Reitz]

The call to bdrv_getlength() from qcow2_check_refcounts() may result in
an error. Check this and abort if necessary.

Signed-off-by: Max Reitz <address@hidden>
---
 block/qcow2-refcount.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/block/qcow2-refcount.c b/block/qcow2-refcount.c
index e6fc30e..76da3ab 100644
--- a/block/qcow2-refcount.c
+++ b/block/qcow2-refcount.c
@@ -1487,6 +1487,11 @@ int qcow2_check_refcounts(BlockDriverState *bs, 
BdrvCheckResult *res,
     int ret;
 
     size = bdrv_getlength(bs->file);
+    if (size < 0) {
+        res->check_errors++;
+        return size;
+    }
+
     nb_clusters = size_to_clusters(s, size);
     if (nb_clusters > INT_MAX) {
         res->check_errors++;
-- 
1.9.2