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Date: Fri, 28 Apr 2017 13:41:31 +0200
From: Sabrina Dubroca <sd@...asysnail.net>
To: "Jason A. Donenfeld" <Jason@...c4.com>
Cc: netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
David.Laight@...lab.com, kernel-hardening@...ts.openwall.com,
davem@...emloft.net
Subject: Re: [PATCH v6 3/5] rxrpc: check return value of skb_to_sgvec always
2017-04-25, 20:47:32 +0200, Jason A. Donenfeld wrote:
> Signed-off-by: Jason A. Donenfeld <Jason@...c4.com>
> ---
> net/rxrpc/rxkad.c | 10 +++++++---
> 1 file changed, 7 insertions(+), 3 deletions(-)
>
> diff --git a/net/rxrpc/rxkad.c b/net/rxrpc/rxkad.c
> index 4374e7b9c7bf..dcf46c9c3ece 100644
> --- a/net/rxrpc/rxkad.c
> +++ b/net/rxrpc/rxkad.c
[...]
> @@ -429,7 +432,8 @@ static int rxkad_verify_packet_2(struct rxrpc_call *call, struct sk_buff *skb,
> }
>
Adding a few more lines of context:
sg = _sg;
if (unlikely(nsg > 4)) {
sg = kmalloc(sizeof(*sg) * nsg, GFP_NOIO);
if (!sg)
goto nomem;
}
> sg_init_table(sg, nsg);
> - skb_to_sgvec(skb, sg, offset, len);
> + if (unlikely(skb_to_sgvec(skb, sg, offset, len) < 0))
> + goto nomem;
You're leaking sg when nsg > 4, you'll need to add this:
if (sg != _sg)
kfree(sg);
BTW, when you resubmit, please Cc: the maintainers of the files you're
changing for each patch, so that they can review this stuff. And send
patch 1 to all of them, otherwise they might be surprised that we even
need <0 checking after calls to skb_to_sgvec.
You might also want to add a cover letter.
--
Sabrina
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