[CRIU] [PATCH] mount: Corrent sibling path when parent and child have the same mountpoint

[Kirill Tkhai]

When m and pa are mounted in the same directory, rpath is initialized
to empty string (rpath[0] points to '\0'). In this case snprintf() at
the bottom of function makes path have '/' at the end.

In further, function validate_shared(), which uses the result, calls
find_shared_peer() and fails to find a peer.

https://jira.sw.ru/browse/PSBM-52346

Signed-off-by: Kirill Tkhai <ktkhai at virtuozzo.com>
---
 criu/path.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/criu/path.c b/criu/path.c
index 1c7c257..c43b5e2 100644
--- a/criu/path.c
+++ b/criu/path.c
@@ -94,7 +94,8 @@ char *mnt_get_sibling_path(struct mount_info *m,
 	if (rpath[0] == '/')
 		rpath++;
 
-	off = snprintf(path, len, "/%s", rpath);
+	if (rpath[0] != '\0')
+		off = snprintf(path, len, "/%s", rpath);
 
 	return buf;
 }