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Date:   Mon, 9 Mar 2020 19:58:24 -0700
From:   Alexei Starovoitov <>
To:     Andrii Nakryiko <>
Cc:     bpf <>,
        Network Development <>,
        Alexei Starovoitov <>,
        Daniel Borkmann <>,
        Andrii Nakryiko <>,
        Kernel Team <>
Subject: Re: [PATCH bpf-next] bpf: initialize storage pointers to NULL to
 prevent freeing garbage pointer

On Mon, Mar 9, 2020 at 3:28 PM Andrii Nakryiko <> wrote:
> Local storage array isn't initialized, so if cgroup storage allocation fails
> for BPF_CGROUP_STORAGE_SHARED, error handling code will attempt to free
> uninitialized pointer for BPF_CGROUP_STORAGE_PERCPI storage type. Avoid this
> by always initializing storage pointers to NULLs.
> Fixes: 8bad74f9840f ("bpf: extend cgroup bpf core to allow multiple cgroup storage types")
> Signed-off-by: Andrii Nakryiko <>

Applied to bpf tree and fixed typo in commit log.

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