linux-kernel - Re: [PATCH] RDMA/nldev: Fix multiple potential NULL pointer dereferences

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Message-ID: <20180209122549.GK2197@mtr-leonro.local>
Date:   Fri, 9 Feb 2018 14:25:49 +0200
From:   Leon Romanovsky <leon@...nel.org>
To:     "Gustavo A. R. Silva" <gustavo@...eddedor.com>
Cc:     Doug Ledford <dledford@...hat.com>, Jason Gunthorpe <jgg@...pe.ca>,
        linux-rdma@...r.kernel.org, linux-kernel@...r.kernel.org,
        "Gustavo A. R. Silva" <garsilva@...eddedor.com>
Subject: Re: [PATCH] RDMA/nldev: Fix multiple potential NULL pointer
 dereferences

On Fri, Feb 09, 2018 at 12:37:02AM -0600, Gustavo A. R. Silva wrote:
> In case the message header and payload cannot be stored, function
> nlmsg_put returns null.
>
> Fix this by adding multiple sanity checks and avoid a potential
> null dereference on _nlh_ when calling nlmsg_end.
>
> Addresses-Coverity-ID: 1454215 ("Dereference null return value")
> Addresses-Coverity-ID: 1454223 ("Dereference null return value")
> Addresses-Coverity-ID: 1454224 ("Dereference null return value")
> Addresses-Coverity-ID: 1464669 ("Dereference null return value")
> Addresses-Coverity-ID: 1464670 ("Dereference null return value")
> Addresses-Coverity-ID: 1464672 ("Dereference null return value")
> Fixes: e5c9469efcb1 ("RDMA/netlink: Add nldev device doit implementation")
> Fixes: c3f66f7b0052 ("RDMA/netlink: Implement nldev port doit callback")
> Fixes: 7d02f605f0dc ("RDMA/netlink: Add nldev port dumpit implementation")
> Fixes: b5fa635aab8f ("RDMA/nldev: Provide detailed QP information")
> Fixes: bf3c5a93c523 ("RDMA/nldev: Provide global resource utilization")
> Signed-off-by: Gustavo A. R. Silva <gustavo@...eddedor.com>
> ---
>  drivers/infiniband/core/nldev.c | 26 +++++++++++++++++++++++++-
>  1 file changed, 25 insertions(+), 1 deletion(-)
>

It will be much better to fix the tool instead of fixing ghost case.
This scenario is impossible for all those flows.
We can receive the skv/msg in two ways:
 * First by allocating new message with NLMSG_DEFAULT_SIZE, which has more room
   than nlmsg_total_size(payload), payload is 0.
 * Second by getting from netlink.c and it will be at least "struct nlmsghdr" too.

Can you please add this info to the commit message?

Thanks

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