netdev - Re: [PATCH] fix noderef.cocci warnings

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Message-ID: <5c5eaeee-dfaa-d75e-8ece-a72c7ff467ec@cumulusnetworks.com>
Date:   Wed, 24 Jul 2019 02:21:12 +0300
From:   Nikolay Aleksandrov <nikolay@...ulusnetworks.com>
To:     kbuild test robot <lkp@...el.com>
Cc:     kbuild-all@...org, Martin Weinelt <martin@...uxlounge.net>,
        bridge@...ts.linux-foundation.org,
        Roopa Prabhu <roopa@...ulusnetworks.com>,
        netdev@...r.kernel.org
Subject: Re: [PATCH] fix noderef.cocci warnings

On 7/24/19 1:54 AM, kbuild test robot wrote:
> From: kbuild test robot <lkp@...el.com>
> 
> net/bridge/br_multicast.c:999:8-14: ERROR: application of sizeof to pointer
> 
>  sizeof when applied to a pointer typed expression gives the size of
>  the pointer
> 
> Generated by: scripts/coccinelle/misc/noderef.cocci
> 
> Fixes: 17c91348ed8b ("Use-after-free in br_multicast_rcv")
> CC: Nikolay Aleksandrov <nikolay@...ulusnetworks.com>
> Signed-off-by: kbuild test robot <lkp@...el.com>
> ---
> 
> url:    https://github.com/0day-ci/linux/commits/Nikolay-Aleksandrov/net-bridge-mcast-fix-possible-uses-of-stale-pointers/20190702-083354
> 
>  br_multicast.c |    2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> --- a/net/bridge/br_multicast.c
> +++ b/net/bridge/br_multicast.c
> @@ -996,7 +996,7 @@ static int br_ip6_multicast_mld2_report(
>  			return -EINVAL;
>  
>  		_nsrcs = skb_header_pointer(skb, nsrcs_offset,
> -					   sizeof(_nsrcs), &__nsrcs);
> +					   sizeof(*_nsrcs), &__nsrcs);
>  		if (!_nsrcs)
>  			return -EINVAL;
>  
> 

This must be quite old, I already sent a proper patch without this error.
This one was sent just for testing, hence the TEST in $subject.

 [PATCH TEST] net: bridge: mcast: fix possible uses of stale pointers

Thanks,
 Nik