linux-kernel - Re: [tip:tracing/ftrace] tracing: fix oops in tracepoint_update_probe

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Message-Id: <1237398778.22438.7.camel@ht.satnam>
Date:	Wed, 18 Mar 2009 23:22:58 +0530
From:	Jaswinder Singh Rajput <jaswinder@...nel.org>
To:	mingo@...hat.com
Cc:	hpa@...or.com, linux-kernel@...r.kernel.org,
	jaswinderrajput@...il.com, fweisbec@...il.com, rostedt@...dmis.org,
	tglx@...utronix.de, mingo@...e.hu,
	linux-tip-commits@...r.kernel.org
Subject: Re: [tip:tracing/ftrace] tracing: fix oops in
 tracepoint_update_probe_range()

On Wed, 2009-03-18 at 23:08 +0530, Jaswinder Singh Rajput wrote:
> On Wed, 2009-03-18 at 17:33 +0000, Jaswinder Singh Rajput wrote:
> > Commit-ID:  7d1832698e6e422cc2cf0d80b9c50ca567e758a3
> > Gitweb:     http://git.kernel.org/tip/7d1832698e6e422cc2cf0d80b9c50ca567e758a3
> > Author:     Jaswinder Singh Rajput <jaswinder@...nel.org>
> > AuthorDate: Wed, 18 Mar 2009 22:18:56 +0530
> > Commit:     Ingo Molnar <mingo@...e.hu>
> > CommitDate: Wed, 18 Mar 2009 18:30:43 +0100
> > 
> > tracing: fix oops in tracepoint_update_probe_range()
> > 
> > Change this crash:
> > 
> >  BUG: unable to handle kernel NULL pointer dereference at (null)
> >  IP: [<ffffffff8107d4de>] tracepoint_update_probe_range+0x1f/0x9b
> >  PGD 13d5fb067 PUD 13d688067 PMD 0
> >  Oops: 0000 [#1] SMP
> > 
> > To a more debuggable WARN_ONCE().
> > 
> > Signed-off-by: Jaswinder Singh Rajput <jaswinderrajput@...il.com>
> > Cc: Frederic Weisbecker <fweisbec@...il.com>
> > Cc: Steven Rostedt <rostedt@...dmis.org>
> > LKML-Reference: <1237394936.3132.1.camel@...alhost.localdomain>
> > [ moved the check outside the lock and added a WARN_ON(). ]
> > Signed-off-by: Ingo Molnar <mingo@...e.hu>
> > 
> > 
> > ---
> >  kernel/tracepoint.c |    9 +++++++--
> >  1 files changed, 7 insertions(+), 2 deletions(-)
> > 
> > diff --git a/kernel/tracepoint.c b/kernel/tracepoint.c
> > index 7960274..8bc1a06 100644
> > --- a/kernel/tracepoint.c
> > +++ b/kernel/tracepoint.c
> > @@ -272,12 +272,17 @@ static void disable_tracepoint(struct tracepoint *elem)
> >   *
> >   * Updates the probe callback corresponding to a range of tracepoints.
> >   */
> > -void tracepoint_update_probe_range(struct tracepoint *begin,
> > -	struct tracepoint *end)
> > +void
> > +tracepoint_update_probe_range(struct tracepoint *begin, struct tracepoint *end)
> >  {
> >  	struct tracepoint *iter;
> >  	struct tracepoint_entry *mark_entry;
> >  
> > +	if (!iter) {
> > +		WARN_ON_ONCE(1);
> > +		goto out;
> > +	}
> > +
> 
> There is no out, it should be :
> 
> +	if (!iter) {
> +		WARN_ON_ONCE(1);
> +		return;
> +	}
> +
> 

hmm, who is setting iter :p

--
JSR

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