[PACKET]: Fix /proc/net/packet crash due to bogus private pointer

Herbert Xu
2007-12-16T03:41:48Z

On Sun, Dec 16, 2007 at 11:07:07AM +0800, Herbert Xu wrote:
>
> I suspect namespace borkage. But just because you pin-pointed
> my patch I'll try to track it down :)

Surprise surprise. The namespace seq patch missed two spots in
AF_PACKET.

[PACKET]: Fix /proc/net/packet crash due to bogus private pointer

The seq_open_net patch changed the meaning of seq->private.
Unfortunately it missed two spots in AF_PACKET, which still
used the old way of dereferencing seq->private, thus causing
weird and wonderful crashes when reading /proc/net/packet.

This patch fixes them.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

diff --git a/net/packet/af_packet.c b/net/packet/af_packet.c
index 485af56..43e49f4 100644
--- a/net/packet/af_packet.c
+++ b/net/packet/af_packet.c
@@ -1878,7 +1878,7 @@ static void *packet_seq_start(struct seq_file *seq, loff_t *pos)

static void *packet_seq_next(struct seq_file *seq, void *v, loff_t *pos)
{
- struct net *net = seq->private;
+ struct net *net = seq_file_net(seq);
++*pos;
return (v == SEQ_START_TOKEN)
? sk_head(&net->packet.sklist)
@@ -1887,7 +1887,7 @@ static void *packet_seq_next(struct seq_file *seq, void *v, loff_t *pos)

static void packet_seq_stop(struct seq_file *seq, void *v)
{
- struct net *net = seq->private;
+ struct net *net = seq_file_net(seq);
read_unlock(&net->packet.sklist_lock);
}

Cheers,
--
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Email: Herbert Xu ~{PmV>HI~} <herbert@gondor.apana.org.au>
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