netdev - Re: [PATCH] xdp_rxq_info_user: Fix null pointer dereference. Replace malloc/memset with calloc.

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Message-ID: <20200612222031.515d5338@carbon>
Date:   Fri, 12 Jun 2020 22:20:31 +0200
From:   Jesper Dangaard Brouer <brouer@...hat.com>
To:     Gaurav Singh <gaurav1086@...il.com>
Cc:     brouer@...hat.com, Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Jesper Dangaard Brouer <hawk@...nel.org>,
        John Fastabend <john.fastabend@...il.com>,
        Martin KaFai Lau <kafai@...com>,
        Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
        Andrii Nakryiko <andriin@...com>,
        KP Singh <kpsingh@...omium.org>,
        netdev@...r.kernel.org (open list:XDP (eXpress Data Path)),
        bpf@...r.kernel.org (open list:XDP (eXpress Data Path)),
        linux-kernel@...r.kernel.org (open list)
Subject: Re: [PATCH] xdp_rxq_info_user: Fix null pointer dereference.
 Replace malloc/memset with calloc.

On Fri, 12 Jun 2020 14:53:27 -0400
Gaurav Singh <gaurav1086@...il.com> wrote:

> Memset on the pointer right after malloc can cause a
> null pointer deference if it failed to allocate memory.
> A simple fix is to replace malloc/memset with a calloc()
> 
> Fixes: 0fca931a6f21 ("samples/bpf: program demonstrating access to xdp_rxq_info")
> Signed-off-by: Gaurav Singh <gaurav1086@...il.com>

Acked-by: Jesper Dangaard Brouer <brouer@...hat.com>

-- 
Best regards,
  Jesper Dangaard Brouer
  MSc.CS, Principal Kernel Engineer at Red Hat
  LinkedIn: http://www.linkedin.com/in/brouer