linux-kernel - Re: [PATCH] tools/lib/traceevent: Fix processing of dereferenced args in bprintk events

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Date:   Tue, 11 Dec 2018 09:29:52 -0300
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
To:     Steven Rostedt <rostedt@...dmis.org>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        Linux Trace Devel <linux-trace-devel@...r.kernel.org>,
        Jiri Olsa <jolsa@...hat.com>, Ingo Molnar <mingo@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>
Subject: Re: [PATCH] tools/lib/traceevent: Fix processing of dereferenced
 args in bprintk events

Em Mon, Dec 10, 2018 at 04:26:21PM -0500, Steven Rostedt escreveu:
> On Mon, 10 Dec 2018 15:48:07 -0300
> Arnaldo Carvalho de Melo <acme@...nel.org> wrote:
> 
> > Em Mon, Dec 10, 2018 at 01:45:22PM -0500, Steven Rostedt escreveu:
> > > From: "Steven Rostedt (VMware)" <rostedt@...dmis.org>
> > > 
> > > In the case that a bprintk event has a dereferenced pointer that is stored
> > > as a string, and there's more values to process (more args), the arg was not
> > > updated to point to the next arg after processing the dereferenced pointer,
> > > and it screwed up what was to be displayed.  
> > 
> > Thanks, applied.
> >  
> > > Cc: stable@...r.kernel.org
> > > Fixes: 7db96bb49629 ("tools lib traceevent: Handle new pointer processing of bprint strings")  
> 
> Arnaldo,
> 
> It seems that I cut and pasted the sha1 of the "fixes" part wrong. Can
> you add a "3". That is, the above should have been: 37db96bb49629

Done, git rebase -i + reword -> push -f'ed :-)

https://git.kernel.org/acme/c/1e862fa6b4e9

- Arnaldo
 
> Thanks,
> 
> -- Steve
> 
> > 
> > > Signed-off-by: Steven Rostedt (VMware) <rostedt@...dmis.org>
> > > ---
> > >  tools/lib/traceevent/event-parse.c | 1 +
> > >  1 file changed, 1 insertion(+)
> > > 
> > > diff --git a/tools/lib/traceevent/event-parse.c b/tools/lib/traceevent/event-parse.c
> > > index 3692f29fee46..70144b98141c 100644
> > > --- a/tools/lib/traceevent/event-parse.c
> > > +++ b/tools/lib/traceevent/event-parse.c
> > > @@ -4970,6 +4970,7 @@ static void pretty_print(struct trace_seq *s, void *data, int size, struct tep_e
> > >  
> > >  				if (arg->type == TEP_PRINT_BSTRING) {
> > >  					trace_seq_puts(s, arg->string.string);
> > > +					arg = arg->next;
> > >  					break;
> > >  				}
> > >  
> > > -- 
> > > 2.19.1  
> > 

-- 

- Arnaldo