[PATCH] block: Fix integer promotion error in bdrv_getlength()

[Tuguoyi]

As BDRV_SECTOR_SIZE is of type uint64_t, the expression will
automatically convert the @ret to uint64_t. When an error code
returned from bdrv_nb_sectors(), the promoted @ret will be a very
large number, as a result the -EFBIG will be returned which is not the
real error code.

Signed-off-by: Guoyi Tu <tu.guoyi@h3c.com>
---
 block.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/block.c b/block.c
index 430edf7..f14254c 100644
--- a/block.c
+++ b/block.c
@@ -5082,7 +5082,7 @@ int64_t bdrv_getlength(BlockDriverState *bs)
 {
     int64_t ret = bdrv_nb_sectors(bs);
 
-    ret = ret > INT64_MAX / BDRV_SECTOR_SIZE ? -EFBIG : ret;
+    ret = ret > INT64_MAX / (int64_t)BDRV_SECTOR_SIZE ? -EFBIG : ret;
     return ret < 0 ? ret : ret * BDRV_SECTOR_SIZE;
 }
 
-- 
2.7.4

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

--
Best regards,
Guoyi