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cgroup/psi: Set of->priv to NULL upon file release

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JIRA: https://redhat.atlassian.net/browse/RHEL-232556

commit 94a4acfec14615e971eb2c9e1fa6c992c85ff6c6
Author: Chen Ridong <chenridong@huawei.com>
Date:   Fri, 22 Aug 2025 07:07:15 +0000

    cgroup/psi: Set of->priv to NULL upon file release

    Setting of->priv to NULL when the file is released enables earlier bug
    detection. This allows potential bugs to manifest as NULL pointer
    dereferences rather than use-after-free errors[1], which are generally more
    difficult to diagnose.

    [1] https://lore.kernel.org/cgroups/38ef3ff9-b380-44f0-9315-8b3714b0948d@huaweicloud.com/T/#m8a3b3f88f0ff3da5925d342e90043394f8b2091b
    Signed-off-by: Chen Ridong <chenridong@huawei.com>
    Signed-off-by: Tejun Heo <tj@kernel.org>

Signed-off-by: Waiman Long <longman@redhat.com>
This commit is contained in:
Waiman Long
2026-08-13 11:43:41 -04:00
parent fe99498ed8
commit 0a075353ea
1 changed files with 1 additions and 0 deletions
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kernel/cgroup/cgroup.c
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@@ -4197,6 +4197,7 @@ static void cgroup_file_release(struct kernfs_open_file *of)
cft->release(of);
put_cgroup_ns(ctx->ns);
kfree(ctx);
of->priv = NULL;
}
static ssize_t cgroup_file_write(struct kernfs_open_file *of, char *buf,