linux-kernel - Re: [PATCH 3.8 003/152] cxgb3: Fix length calculation in write_ofld

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Message-ID: <20131207001024.GT31504@decadent.org.uk>
Date:	Sat, 7 Dec 2013 00:10:24 +0000
From:	Ben Hutchings <ben@...adent.org.uk>
To:	Kamal Mostafa <kamal@...onical.com>
Cc:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	kernel-team@...ts.ubuntu.com,
	"David S. Miller" <davem@...emloft.net>
Subject: Re: [PATCH 3.8 003/152] cxgb3: Fix length calculation in
 write_ofld_wr() on 32-bit architectures

On Fri, Dec 06, 2013 at 03:08:47PM -0800, Kamal Mostafa wrote:
> 3.8.13.14 -stable review patch.  If anyone has any objections, please let me know.
> 
> ------------------
> 
> From: Ben Hutchings <ben@...adent.org.uk>
> 
> [ Upstream commit 262e827fe745642589450ae241b7afd3912c3f25 ]
> 
> The length calculation here is now invalid on 32-bit architectures,
> since sk_buff::tail is a pointer and sk_buff::transport_header is
> an integer offset:
> 
> drivers/net/ethernet/chelsio/cxgb3/sge.c: In function 'write_ofld_wr':
> drivers/net/ethernet/chelsio/cxgb3/sge.c:1603:9: warning: passing argument 4 of 'make_sgl' makes integer from pointer without a cast [enabled by default]
>          adap->pdev);
>          ^
> drivers/net/ethernet/chelsio/cxgb3/sge.c:964:28: note: expected 'unsigned int' but argument is of type 'sk_buff_data_t'
>  static inline unsigned int make_sgl(const struct sk_buff *skb,
>                             ^
> 
> Use the appropriate skb accessor functions.
> 
> Compile-tested only.
> 
> Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
> Fixes: 1a37e412a022 ('net: Use 16bits for *_headers fields of struct skbuff')
[...]

This is only needed for 3.11+, though it should be harmless for
older versions.

Ben.

-- 
Ben Hutchings
Design a system any fool can use, and only a fool will want to use it.
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