From: David Miller <davem@davemloft.net>
To: alexander.duyck@gmail.com
Cc: alexander.h.duyck@redhat.com, eric.dumazet@gmail.com,
David.Laight@ACULAB.COM, netdev@vger.kernel.org
Subject: Re: [PATCH] flow-dissector: Fix alignment issue in __skb_flow_get_ports
Date: Fri, 10 Oct 2014 14:22:55 -0400 (EDT) [thread overview]
Message-ID: <20141010.142255.359367991309840826.davem@davemloft.net> (raw)
In-Reply-To: <20141010.141559.2024576018585843684.davem@davemloft.net>
From: David Miller <davem@davemloft.net>
Date: Fri, 10 Oct 2014 14:15:59 -0400 (EDT)
> Your original code works because you do things like "byte[12] & 0xf0" to
> extract these fields.
Changing that th->doff sequence to instead be:
const u8 *bp;
u8 buf[13];
bp = __skb_header_pointer(skb, poff, sizeof(buf),
data, hlen, &buf);
if (!bp)
return poff;
poff += max_t(u32, sizeof(struct tcphdr), (bp[12] & 0xf0) >> 2);
break;
on top of your v3 patch works for me.
Please double-check my calculations.
next prev parent reply other threads:[~2014-10-10 18:22 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-10-10 0:12 eth_get_headlen() and unaligned accesses David Miller
2014-10-10 3:10 ` Alexander Duyck
2014-10-10 4:43 ` David Miller
2014-10-10 10:59 ` David Laight
2014-10-10 4:03 ` [PATCH] flow-dissector: Fix alignment issue in __skb_flow_get_ports alexander.duyck
2014-10-10 4:47 ` David Miller
2014-10-10 14:42 ` Alexander Duyck
2014-10-10 14:57 ` David Laight
2014-10-10 15:14 ` Alexander Duyck
2014-10-10 15:29 ` Eric Dumazet
2014-10-10 16:50 ` Alexander Duyck
2014-10-10 17:58 ` David Miller
2014-10-10 18:02 ` Alexander Duyck
2014-10-10 18:14 ` David Miller
2014-10-10 18:15 ` David Miller
2014-10-10 18:22 ` David Miller [this message]
2014-10-10 18:53 ` Alexander Duyck
2014-10-10 19:32 ` David Miller
2014-10-13 8:32 ` David Laight
2014-10-10 15:33 ` Eric Dumazet
2014-10-10 16:30 ` David Laight
2014-10-10 16:41 ` David Miller
2014-10-10 14:59 ` [PATCH v2] " alexander.duyck
2014-10-10 15:36 ` Eric Dumazet
2014-10-10 17:55 ` David Miller
2014-10-10 18:41 ` eth_get_headlen() and unaligned accesses Tom Herbert
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