[CRIU] [PATCH 1/2] mount: Cleanup readlinkat calling

[Cyrill Gorcunov]

 - Use sizeof instead of PATH_MAX constant
 - Place EOS exactly after read data end

Signed-off-by: Cyrill Gorcunov <gorcunov at openvz.org>
---
 mount.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/mount.c b/mount.c
index be907a9..295808a 100644
--- a/mount.c
+++ b/mount.c
@@ -511,11 +511,11 @@ int mntns_collect_root(pid_t pid)
 	 * and a root of mntns is the same. */
 
 	pfd = open_pid_proc(pid);
-	ret = readlinkat(pfd, "root", path, PATH_MAX);
+	ret = readlinkat(pfd, "root", path, sizeof(path) - 1);
 	if (ret < 0)
 		return ret;
 
-	path[ret + 1] = '\0';
+	path[ret] = '\0';
 
 	if (ret != 1 || path[0] != '/') {
 		pr_err("The root task has another root than mntns: %s\n", path);
-- 
1.7.7.6