linux-kernel - Re: [PATCH] ramfs: fix double freeing s_fs

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Message-ID: <20090407070507.GA500@localhost>
Date:	Tue, 7 Apr 2009 15:05:07 +0800
From:	Wu Fengguang <fengguang.wu@...el.com>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Avan Anishchuk <matimatik@...il.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Pekka Enberg <penberg@...helsinki.fi>,
	Steven Rostedt <rostedt@...dmis.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Eduard - Gabriel Munteanu <eduard.munteanu@...ux360.ro>
Subject: Re: [PATCH] ramfs: fix double freeing s_fs_info on failed mount

On Tue, Apr 07, 2009 at 02:53:08PM +0800, Ingo Molnar wrote:
> 
> * Wu Fengguang <fengguang.wu@...el.com> wrote:
> 
> > From: Ingo Molnar <mingo@...e.hu>
> > 
> > If ramfs mount fails, s_fs_info will be freed twice in 
> > ramfs_fill_super() and ramfs_kill_sb(), leading to kernel oops.
> > 
> > Consolidate and beautify the code. Make sure s_fs_info and s_root 
> > are in known good states.
> > 
> > Acked-by: Wu Fengguang <fengguang.wu@...el.com>
> > Signed-off-by: Ingo Molnar <mingo@...e.hu>
> 
> Nit: the commit is missing a Reported-by :)
> 
> Linus might not insist on seeing his name mentioned yet another time 
> in a commit, but it's generally good practice to always add bug 
> report info and names.
> 
> Note that in this case the really hard work was there: Linus had to 
> spend at least 2 hours on tracking down and bisecting this bug. (and 
> Linus probably did this super-fast compared to the average tester - 
> most other bug reporters spend a day or more on bisection, limited 
> by lack of practice and by the slowness of kernel builds on ordinary 
> hardware.)
> 
> So the real human effort was spent there, not in my 5 minutes on 
> fixing the bug that Linus served on a plate - while the commit only 
> credits me. That's not fair :)

Good point! Thank you very much for mentoring me on this whole process!

> See the tip:out-of-tree local commit i made and sent out.

Yes I've seen that, very comprehensive changelog and solid&pretty code!

Best regards,
Fengguang Wu

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