On Thursday 14 August 2014 13:12:13 Kalle Valo wrote:
> Simon Wunderlich <s...@simonwunderlich.de> writes:
> > If spectral is unregistered after mac80211, the relayfs file has already
> > been removed recursively by mac/cfg80211, and spectral tries to remove
> > the file once more, thus leading to double free problems. Better clean
> > up spectral before to avoid that problem.
> >
> > Reported-by: Kalle Valo <kv...@qca.qualcomm.com>
> > Signed-off-by: Simon Wunderlich <s...@simonwunderlich.de>
>
> Thanks for checking this. But I'm just wondering why even bother to call
> relay_close() in the first place if mac80211 recursively removes
> everything anyway? We don't remove any of the debugfs files anyway.
We need to relay_close() in any case because this function also causes to
clean up internal buffers of relayfs.
An alternative to this patch could be to instead having
remove_buf_file_handler() call debugfs_remove() just do nothing and relay on
the upper layers to (recursively) remove that file - then, the relayfs stuff
still can get cleaned up. But that's also not very elegant either. If you
prefer that I can prepare a patch though ....
Cheers,
Simon
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