Merge pull request #3884 from brauner/2021-06-28.fixes

cgroups: verify that hierarchies are non-empty

Merge pull request #3884 from brauner/2021-06-28.fixes
5e3ec989 · Wolfgang Bumiller · GitHub · 0aa47c8f · 414fbacc · 5e3ec989
Unverified Commit 5e3ec989 authored Jun 28, 2021 by Wolfgang Bumiller Committed by GitHub Jun 28, 2021
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cgroup.h src/lxc/cgroups/cgroup.h +3 -0

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--- a/src/lxc/cgroups/cgroup.h
+++ b/src/lxc/cgroups/cgroup.h
@@ -326,6 +326,9 @@ static inline int prepare_cgroup_ctx(struct cgroup_ops *ops,
 {
 	__u32 idx;

+	if (!ops || !ops->hierarchies)
+		return ret_errno(ENOENT);
+
 	for (idx = 0; ops->hierarchies[idx]; idx++) {
 		if (idx >= CGROUP_CTX_MAX_FD)
 			return ret_errno(E2BIG);