c/r: check that cgroup_num_hierarchies > 0

Otherwise in the error case, we end up subtracting two from the static_args, which would lead to a segfault :) Signed-off-by: Tycho Andersen <tycho.andersen@canonical.com>

c/r: check that cgroup_num_hierarchies > 0
8b4e6d69 · Tycho Andersen · Stéphane Graber · d7e0fb80 · 8b4e6d69
Commit 8b4e6d69 authored Sep 16, 2016 by Tycho Andersen Committed by Stéphane Graber Sep 23, 2016
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criu.c src/lxc/criu.c +2 -1

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--- a/src/lxc/criu.c
+++ b/src/lxc/criu.c
@@ -191,7 +191,8 @@ static void exec_criu(struct criu_opts *opts)
 		return;
 	}
-	static_args += 2 * cgroup_num_hierarchies();
+	if (cgroup_num_hierarchies() > 0)
+		static_args += 2 * cgroup_num_hierarchies();
 	if (opts->user->verbose)
 		static_args++;