Do not use strlen() on non-null terminated buffer

src/lxc/lxccontainer.c

@@ -1989,7 +1989,7 @@ static bool mod_rdep(struct lxc_container *c0, struct lxc_container *c, bool inc
 	char newpath[MAXPATHLEN];
 	int fd, ret, n = 0, v = 0;
 	bool bret = false;
-	size_t len;
+	size_t len, difflen;
 
 	if (container_disk_lock(c0))
 		return false;
@@ -2074,7 +2074,10 @@ static bool mod_rdep(struct lxc_container *c0, struct lxc_container *c, bool inc
 			 * a multiple of a pagesize. Hence, we'll use memmem(). */
                         if ((del = memmem(buf, fbuf.st_size, newpath, len))) {
                                 /* remove container entry */
-				memmove(del, del + len, strlen(del) - len + 1);
+                                if (del != buf + fbuf.st_size - len) {
+                                        difflen = fbuf.st_size - (del-buf);
+                                        memmove(del, del + len, strnlen(del, difflen) - len);
+                                }
 
                                 munmap(buf, fbuf.st_size);