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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>
This commit is contained in:
Chen Ridong 2025-08-22 07:07:15 +00:00 committed by Tejun Heo
parent 79f919a89c
commit 94a4acfec1
1 changed files with 1 additions and 0 deletions
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kernel/cgroup/cgroup.c
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@ -4182,6 +4182,7 @@ static void cgroup_file_release(struct kernfs_open_file *of)
cft->release(of); cft->release(of);
put_cgroup_ns(ctx->ns); put_cgroup_ns(ctx->ns);
kfree(ctx); kfree(ctx);
of->priv = NULL;
} }
static ssize_t cgroup_file_write(struct kernfs_open_file *of, char *buf, static ssize_t cgroup_file_write(struct kernfs_open_file *of, char *buf,