netdev - [PATCH] net: fix skb_seq_read returning wrong offset/length for page frag data

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Date:	Wed, 13 May 2009 20:33:11 -0500
From:	<Thomas_Chenault@...l.com>
To:	<netdev@...r.kernel.org>
Cc:	<Shyam_Iyer@...l.com>, <michaelc@...wisc.edu>
Subject: [PATCH] net: fix skb_seq_read returning wrong offset/length for page frag data

When called with a consumed value that is less than skb_headlen(skb)
bytes into a page frag, skb_seq_read() incorrectly returns an
offset/length relative to skb->data. Ensure that data which should come
from a page frag does.

Signed-off-by: Thomas Chenault <thomas_chenault@...l.com>

diff --git a/net/core/skbuff.c b/net/core/skbuff.c
index d152394..e505b53 100644
--- a/net/core/skbuff.c
+++ b/net/core/skbuff.c
@@ -2288,7 +2288,7 @@ unsigned int skb_seq_read(unsigned int consumed,
const u8 **data,
 next_skb:
 	block_limit = skb_headlen(st->cur_skb) + st->stepped_offset;
 
-	if (abs_offset < block_limit) {
+	if (abs_offset < block_limit && !st->frag_data) {
 		*data = st->cur_skb->data + (abs_offset -
st->stepped_offset);
 		return block_limit - abs_offset;
 	}
--
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