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cgroups: verify that hierarchies are non-empty

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Fixes: #3881
Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>
This commit is contained in:
Christian Brauner
2021-06-28 09:44:20 +02:00
parent 3efa0cf345
commit 13facae3d7
1 changed files with 3 additions and 0 deletions
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3
src/lxc/cgroups/cgroup.h
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@@ -326,6 +326,9 @@ static inline int prepare_cgroup_ctx(struct cgroup_ops *ops,
{ {
__u32 idx; __u32 idx;
if (!ops || !ops->hierarchies)
return ret_errno(ENOENT);
for (idx = 0; ops->hierarchies[idx]; idx++) { for (idx = 0; ops->hierarchies[idx]; idx++) {
if (idx >= CGROUP_CTX_MAX_FD) if (idx >= CGROUP_CTX_MAX_FD)
return ret_errno(E2BIG); return ret_errno(E2BIG);