linux-kernel - Re: [PATCH] bpf: don't kfree an uninitialized im

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Message-ID: <CAADnVQLZ-uAcDehoWb5ev9pHhkDy9XoEOyKQPg0qSUXw=dzOYw@mail.gmail.com>
Date:   Tue, 24 Jan 2017 09:53:34 -0800
From:   Alexei Starovoitov <alexei.starovoitov@...il.com>
To:     Colin King <colin.king@...onical.com>,
        Daniel Borkmann <daniel@...earbox.net>,
        "David S. Miller" <davem@...emloft.net>
Cc:     Alexei Starovoitov <ast@...nel.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        kernel-janitors@...r.kernel.org,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] bpf: don't kfree an uninitialized im_node

On Tue, Jan 24, 2017 at 6:16 AM, Colin King <colin.king@...onical.com> wrote:
> From: Colin Ian King <colin.king@...onical.com>
>
> There are some error exit paths to the label 'out' that end up
> kfree'ing an uninitialized im_node.  Fix this by inititializing
> im_node to NULL to avoid kfree'ing a garbage address.

this fix already landed. See:
commit d140199af510 ("bpf, lpm: fix kfree of im_node in trie_update_elem")

> Issue found by CoverityScan, CID#1398022 ("Uninitialized pointer read")

Nice. Good to know that static analysis can do such checks.