linux-kernel - [PATCH 1/7] perf trace: Defensive programming

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Date:	Thu, 13 May 2010 16:03:46 +1000
From:	"Ian Munsie" <imunsie@....ibm.com>
To:	linux-kernel@...r.kernel.org
Cc:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Paul Mackerras <paulus@...ba.org>, Ingo Molnar <mingo@...e.hu>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Ian Munsie <imunsie@....ibm.com>,
	Tom Zanussi <tzanussi@...il.com>
Subject: [PATCH 1/7] perf trace: Defensive programming

From: Ian Munsie <imunsie@....ibm.com>

This patch makes the failure case where the size that read_size is
passed is invalid kill perf immediately rather than silently failing, so
that further bugs or regressions using read_size can be found more
easily and squashed early.

Signed-off-by: Ian Munsie <imunsie@....ibm.com>
---
 tools/perf/util/trace-event-parse.c |    3 +--
 1 files changed, 1 insertions(+), 2 deletions(-)

diff --git a/tools/perf/util/trace-event-parse.c b/tools/perf/util/trace-event-parse.c
index 73a0222..8f470f6 100644
--- a/tools/perf/util/trace-event-parse.c
+++ b/tools/perf/util/trace-event-parse.c
@@ -1912,8 +1912,7 @@ unsigned long long read_size(void *ptr, int size)
 	case 8:
 		return data2host8(ptr);
 	default:
-		/* BUG! */
-		return 0;
+		die("read_size BUG: Invalid size %d", size);
 	}
 }
 
-- 
1.7.1

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