[Qemu-devel] [PATCH] block: Check bdrv_getlength() return value in bdrv_make_zero()

[Kevin Wolf]

Signed-off-by: Kevin Wolf <kw...@redhat.com>
---
 block.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/block.c b/block.c
index d268ece..8510ba2 100644
--- a/block.c
+++ b/block.c
@@ -2757,10 +2757,16 @@ int bdrv_write_zeroes(BlockDriverState *bs, int64_t 
sector_num,
  */
 int bdrv_make_zero(BlockDriverState *bs, BdrvRequestFlags flags)
 {
-    int64_t target_size = bdrv_getlength(bs) / BDRV_SECTOR_SIZE;
+    int64_t target_size;
     int64_t ret, nb_sectors, sector_num = 0;
     int n;
 
+    target_size = bdrv_getlength(bs);
+    if (target_size < 0) {
+        return target_size;
+    }
+    target_size /= BDRV_SECTOR_SIZE;
+
     for (;;) {
         nb_sectors = target_size - sector_num;
         if (nb_sectors <= 0) {
-- 
1.8.3.1