[CRIU] [PATCH] cr-check: fill up a root task mount namespace

[Andrei Vagin]

From: Andrei Vagin <avagin at virtuozzo.com>

A root mount namespace list is used to resolve paths to
unix sockets if they are placed on btrfs.

This patch fixes a crash:
 #0 mount_resolve_path at criu/mount.c:213
 #1 phys_stat_resolve_dev at criu/mount.c:240
 #2 phys_stat_dev_match at criu/mount.c:256
 #3 unix_process_name at criu/sk-unix.c:565
 #4 unix_collect_one at criu/sk-unix.c:620
 #5 unix_receive_one at criu/sk-unix.c:692
 #6 nlmsg_receive at criu/libnetlink.c:45
 #7 do_rtnl_req at criu/libnetlink.c:119
 #8 do_collect_req at criu/sockets.c:610
 #9 collect_sockets at criu/sockets.c:636

https://bugzilla.redhat.com/show_bug.cgi?id=1381351
Signed-off-by: Andrei Vagin <avagin at virtuozzo.com>
---
 criu/cr-check.c | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/criu/cr-check.c b/criu/cr-check.c
index 352e9c7..6456486 100644
--- a/criu/cr-check.c
+++ b/criu/cr-check.c
@@ -1017,7 +1017,7 @@ static int (*chk_feature)(void);
 			} while (0)
 int cr_check(void)
 {
-	struct ns_id ns = { .type = NS_CRIU, .ns_pid = PROC_SELF, .nd = &mnt_ns_desc };
+	struct ns_id *ns;
 	int ret = 0;
 
 	if (!is_root_user())
@@ -1032,9 +1032,11 @@ int cr_check(void)
 	if (collect_pstree_ids())
 		return -1;
 
-	ns.id = root_item->ids->mnt_ns_id;
+	ns = lookup_ns_by_id(root_item->ids->mnt_ns_id, &mnt_ns_desc);
+	if (ns == NULL)
+		return -1;
 
-	mntinfo = collect_mntinfo(&ns, false);
+	mntinfo = collect_mntinfo(ns, false);
 	if (mntinfo == NULL)
 		return -1;
 
-- 
2.7.4