[PATCH] block: Return the real error code in bdrv_getlength

[Tuguoyi]

The return code from  bdrv_nb_sectors() should be checked before doing
the following sanity check.

Signed-off-by: Guoyi Tu <tu.guoyi@h3c.com>
---
 block.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/block.c b/block.c
index 430edf7..19ebbc0 100644
--- a/block.c
+++ b/block.c
@@ -5082,6 +5082,10 @@ int64_t bdrv_getlength(BlockDriverState *bs)
 {
     int64_t ret = bdrv_nb_sectors(bs);
 
+    if (ret < 0) {
+        return ret;
+    }
+
     ret = ret > INT64_MAX / BDRV_SECTOR_SIZE ? -EFBIG : ret;
     return ret < 0 ? ret : ret * BDRV_SECTOR_SIZE;
 }
-- 
2.7.4


--
Best regards,
Guoyi