linux-kernel - Re: [PATCH][bpf-next] bpf: fix null pointer dereference on pointer offload

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Message-ID: <20181117044955.c6x6lnajgrlnpoeq@ast-mbp.dhcp.thefacebook.com>
Date:   Fri, 16 Nov 2018 20:49:57 -0800
From:   Alexei Starovoitov <alexei.starovoitov@...il.com>
To:     Colin King <colin.king@...onical.com>
Cc:     Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>, netdev@...r.kernel.org,
        kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH][bpf-next] bpf: fix null pointer dereference on pointer
 offload

On Tue, Nov 13, 2018 at 09:29:26AM +0000, Colin King wrote:
> From: Colin Ian King <colin.king@...onical.com>
> 
> Pointer offload is being null checked however the following statement
> dereferences the potentially null pointer offload when assigning
> offload->dev_state.  Fix this by only assigning it if offload is not
> null.
> 
> Detected by CoverityScan, CID#1475437 ("Dereference after null check")
> 
> Fixes: 00db12c3d141 ("bpf: call verifier_prep from its callback in struct bpf_offload_dev")
> Signed-off-by: Colin Ian King <colin.king@...onical.com>

Applied, Thanks