linux-kernel - Re: [PATCH] trace-view: Handle unknown events more gracefully

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Date:	Fri, 12 Nov 2010 09:04:16 +0100
From:	Jan Kiszka <jan.kiszka@....de>
To:	Steven Rostedt <rostedt@...dmis.org>
CC:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	linux-trace-users@...r.kernel.org
Subject: Re: [PATCH] trace-view: Handle unknown events more gracefully

Am 14.10.2010 21:23, Jan Kiszka wrote:
> Kernel 2.6.35.7 generates invalid trace files due to
> /sys/kernel/debug/tracing/events/scsi/scsi_dispatch_cmd_timeout/format
> returning "FORMAT TOO BIG" (seems to be fixed in 2.6.36). This makes
> pevent_data_event_from_type return NULL, and dereferencing of event
> crashes the viewer.
> 
> Catch and report the error properly.

Ping...

Jan

> 
> Signed-off-by: Jan Kiszka <jan.kiszka@....de>
> ---
>  trace-view-store.c |    7 ++++++-
>  1 files changed, 6 insertions(+), 1 deletions(-)
> 
> diff --git a/trace-view-store.c b/trace-view-store.c
> index 0834df7..34f8155 100644
> --- a/trace-view-store.c
> +++ b/trace-view-store.c
> @@ -507,12 +507,17 @@ trace_view_store_get_value (GtkTreeModel *tree_model,
>  		case TRACE_VIEW_STORE_COL_INFO:
>  			val = pevent_data_type(pevent, data);
>  			event = pevent_data_event_from_type(pevent, val);
> +			if (!event) {
> +				if (column == TRACE_VIEW_STORE_COL_EVENT)
> +					g_value_set_string(value, "[UNKNOWN EVENT]");
> +				break;
> +			}
> +
>  			if (column == TRACE_VIEW_STORE_COL_EVENT) {
>  				g_value_set_string(value, event->name);
>  				break;
>  			}
>  
> -			
>  			trace_seq_init(&s);
>  			pevent_event_info(&s, event, data);
>  			g_value_set_string(value, s.buffer);



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