rbd: plug rbd_dev->header.object_prefix memory leak

Need to free object_prefix when rbd_dev_v2_snap_context() fails, but
only if this is the first time we are reading in the header.

Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
Reviewed-by: Alex Elder <elder@linaro.org>

1 files changed, 4 insertions, 1 deletions

diff --git a/drivers/block/rbd.c b/drivers/block/rbd.c
index 324bf35ec4dd..69d03aa46d0d 100644
--- a/drivers/block/rbd.c
+++ b/drivers/block/rbd.c
@@ -4720,7 +4720,10 @@ static int rbd_dev_v2_header_info(struct rbd_device *rbd_dev)
         }
 
         ret = rbd_dev_v2_snap_context(rbd_dev);
-        dout("rbd_dev_v2_snap_context returned %d\n", ret);
+        if (ret && first_time) {
+                kfree(rbd_dev->header.object_prefix);
+                rbd_dev->header.object_prefix = NULL;
+        }
 
         return ret;
 }