From: "Toke Høiland-Jørgensen" <toke@redhat.com>
To: Joe Perches <joe@perches.com>,
Jesper Dangaard Brouer <jbrouer@redhat.com>,
Gaurav Singh <gaurav1086@gmail.com>
Cc: Alexei Starovoitov <ast@kernel.org>,
Daniel Borkmann <daniel@iogearbox.net>,
"David S. Miller" <davem@davemloft.net>,
Jakub Kicinski <kuba@kernel.org>,
Jesper Dangaard Brouer <hawk@kernel.org>,
John Fastabend <john.fastabend@gmail.com>,
Martin KaFai Lau <kafai@fb.com>, Song Liu <songliubraving@fb.com>,
Yonghong Song <yhs@fb.com>, Andrii Nakryiko <andriin@fb.com>,
KP Singh <kpsingh@chromium.org>,
"open list\:XDP \(eXpress Data Path\)" <netdev@vger.kernel.org>,
"open list\:XDP \(eXpress Data Path\)" <bpf@vger.kernel.org>,
open list <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH] xdp_rxq_info_user: Replace malloc/memset w/calloc
Date: Fri, 12 Jun 2020 14:06:50 +0200 [thread overview]
Message-ID: <8736705vz9.fsf@toke.dk> (raw)
In-Reply-To: <427be84b1154978342ef861f1f4634c914d03a94.camel@perches.com>
Joe Perches <joe@perches.com> writes:
> On Fri, 2020-06-12 at 08:42 +0200, Jesper Dangaard Brouer wrote:
>> On Thu, 11 Jun 2020 20:36:40 -0400
>> Gaurav Singh <gaurav1086@gmail.com> wrote:
>>
>> > Replace malloc/memset with calloc
>> >
>> > Fixes: 0fca931a6f21 ("samples/bpf: program demonstrating access to xdp_rxq_info")
>> > Signed-off-by: Gaurav Singh <gaurav1086@gmail.com>
>>
>> Above is the correct use of Fixes + Signed-off-by.
>>
>> Now you need to update/improve the description, to also
>> mention/describe that this also solves the bug you found.
>
> This is not a fix, it's a conversion of one
> correct code to a shorter one.
No it isn't - the original code memset()s before it checks the return
from malloc(), so it's a potential NULL-pointer reference... Which the
commit message should explain, obviously :)
-Toke
next prev parent reply other threads:[~2020-06-12 12:06 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-06-11 15:02 [PATCH] xdp_rxq_info_user: Replace malloc/memset w/calloc Gaurav Singh
2020-06-11 18:01 ` Jesper Dangaard Brouer
2020-06-12 0:26 ` Gaurav Singh
2020-06-12 0:36 ` Gaurav Singh
2020-06-12 6:42 ` Jesper Dangaard Brouer
2020-06-12 10:14 ` Joe Perches
2020-06-12 12:05 ` Jesper Dangaard Brouer
2020-06-12 15:19 ` Joe Perches
2020-06-12 12:06 ` Toke Høiland-Jørgensen [this message]
2020-06-12 18:53 ` [PATCH] xdp_rxq_info_user: Fix null pointer dereference. Replace malloc/memset with calloc Gaurav Singh
2020-06-12 20:20 ` Jesper Dangaard Brouer
2020-06-12 22:58 ` John Fastabend
2020-06-18 0:11 ` [PATCH] ia64: Add null pointer check for task in default_handler Gaurav Singh
2020-06-18 0:11 ` Gaurav Singh
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