linux-kernel - [tip:perfcounters/core] perf trace: Fix read

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Date:	Thu, 3 Sep 2009 14:28:15 GMT
From:	tip-bot for Ingo Molnar <mingo@...e.hu>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, acme@...hat.com, paulus@...ba.org,
	hpa@...or.com, mingo@...hat.com, a.p.zijlstra@...llo.nl,
	efault@....de, fweisbec@...il.com, tglx@...utronix.de,
	mingo@...e.hu
Subject: [tip:perfcounters/core] perf trace: Fix read_string()

Commit-ID:  6f4596d9312ba5fbf5f3231ef484823c4e684d2e
Gitweb:     http://git.kernel.org/tip/6f4596d9312ba5fbf5f3231ef484823c4e684d2e
Author:     Ingo Molnar <mingo@...e.hu>
AuthorDate: Thu, 3 Sep 2009 16:22:45 +0200
Committer:  Ingo Molnar <mingo@...e.hu>
CommitDate: Thu, 3 Sep 2009 16:22:45 +0200

perf trace: Fix read_string()

We did not account for the enclosing \0. Depending on what malloc()
gave us this resulted in corrupted version string printouts.

Cc: Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc: Mike Galbraith <efault@....de>
Cc: Paul Mackerras <paulus@...ba.org>
Cc: Arnaldo Carvalho de Melo <acme@...hat.com>
Cc: Frederic Weisbecker <fweisbec@...il.com>
LKML-Reference: <new-submission>
Signed-off-by: Ingo Molnar <mingo@...e.hu>


---
 tools/perf/util/trace-event-read.c |    5 ++++-
 1 files changed, 4 insertions(+), 1 deletions(-)

diff --git a/tools/perf/util/trace-event-read.c b/tools/perf/util/trace-event-read.c
index b12e490..a1217a1 100644
--- a/tools/perf/util/trace-event-read.c
+++ b/tools/perf/util/trace-event-read.c
@@ -113,8 +113,11 @@ static char *read_string(void)
 		}
 	}
 
+	/* trailing \0: */
+	i++;
+
 	/* move the file descriptor to the end of the string */
-	r = lseek(input_fd, -(r - (i+1)), SEEK_CUR);
+	r = lseek(input_fd, -(r - i), SEEK_CUR);
 	if (r < 0)
 		die("lseek");
 
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