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SubjectRe: [PATCH] net: Revert "fib_trie: use seq_file_net rather than seq->private"
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From: Sasha Levin <sasha.levin@oracle.com>
Date: Wed, 4 Jun 2014 18:02:32 -0400

> This reverts commit 30f38d2fdd79f13fc929489f7e6e517b4a4bfe63.
>
> fib_triestat is surrounded by a big lie: while it claims that it's a
> seq_file (fib_triestat_seq_open, fib_triestat_seq_show), it isn't:
>
> static const struct file_operations fib_triestat_fops = {
> .owner = THIS_MODULE,
> .open = fib_triestat_seq_open,
> .read = seq_read,
> .llseek = seq_lseek,
> .release = single_release_net,
> };
>
> Yes, fib_triestat is just a regular file.
>
> A small detail (assuming CONFIG_NET_NS=y) is that while for seq_files
> you could do seq_file_net() to get the net ptr, doing so for a regular
> file would be wrong and would dereference an invalid pointer.
>
> The fib_triestat lie claimed a victim, and trying to show the file would
> be bad for the kernel. This patch just reverts the issue and fixes
> fib_triestat, which still needs a rewrite to either be a seq_file or
> stop claiming it is.
>
> Signed-off-by: Sasha Levin <sasha.levin@oracle.com>

Thanks a lot for catching this, applied.


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