netdev - Re: [PATCH bpf-next] bpf: initialize storage pointers to NULL to prevent freeing garbage pointer

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Message-ID: <CAADnVQ+1tDeyMAS=XwvF58fCAUN0929QGE-NNj-i4m6jjLUw3g@mail.gmail.com>
Date:   Mon, 9 Mar 2020 19:58:24 -0700
From:   Alexei Starovoitov <alexei.starovoitov@...il.com>
To:     Andrii Nakryiko <andriin@...com>
Cc:     bpf <bpf@...r.kernel.org>,
        Network Development <netdev@...r.kernel.org>,
        Alexei Starovoitov <ast@...com>,
        Daniel Borkmann <daniel@...earbox.net>,
        Andrii Nakryiko <andrii.nakryiko@...il.com>,
        Kernel Team <kernel-team@...com>
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 <andriin@...com> 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 <andriin@...com>

Applied to bpf tree and fixed typo in commit log.