[CRIU] [PATCH 1/9] restore_root_task(): don't fiddle with closed fd

[Kir Kolyshkin]

In restore_root_task() function, mnt_ns_fd is closed, but then
the function calls try_clean_remaps(mnt_ns_fd) which tries to do
something with the file descriptor which is already closed.

Fix by setting it to -1 after closing.

Reported by Coverity, CID 114629.

Signed-off-by: Kir Kolyshkin <kir at openvz.org>
---
 cr-restore.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/cr-restore.c b/cr-restore.c
index 33205e4..90313a4 100644
--- a/cr-restore.c
+++ b/cr-restore.c
@@ -1847,12 +1847,14 @@ static int restore_root_task(struct pstree_item *init)
 	 */
 	task_entries->nr_threads -= atomic_read(&task_entries->nr_zombies);
 
-	if (mnt_ns_fd >= 0)
+	if (mnt_ns_fd >= 0) {
 		/*
 		 * Don't try_clean_remaps here, since restore went OK
 		 * and all ghosts were removed by the openers.
 		 */
 		close(mnt_ns_fd);
+		mnt_ns_fd = -1;
+	}
 	cleanup_mnt_ns();
 
 	ret = stop_usernsd();
-- 
2.4.3