linux-kernel - [PATCH 1/4] tracing: fix off-by-one in trace_get

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Message-ID: <4AB865FA.5080801@cn.fujitsu.com>
Date:	Tue, 22 Sep 2009 13:51:54 +0800
From:	Li Zefan <lizf@...fujitsu.com>
To:	Steven Rostedt <rostedt@...dmis.org>
CC:	Frederic Weisbecker <fweisbec@...il.com>,
	Jiri Olsa <jolsa@...hat.com>, Ingo Molnar <mingo@...e.hu>,
	LKML <linux-kernel@...r.kernel.org>
Subject: [PATCH 1/4] tracing: fix off-by-one in trace_get_user()

Leave the last slot for the tailing '\0'.

Signed-off-by: Li Zefan <lizf@...fujitsu.com>
---

I spent some time reviewing the trace parser patchset,
and found a few small bugs in it, and here are the fixes.

---
 kernel/trace/trace.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index a35925d..ae17453 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -415,7 +415,7 @@ int trace_get_user(struct trace_parser *parser, const char __user *ubuf,
 
 	/* read the non-space input */
 	while (cnt && !isspace(ch)) {
-		if (parser->idx < parser->size)
+		if (parser->idx < parser->size - 1)
 			parser->buffer[parser->idx++] = ch;
 		else {
 			ret = -EINVAL;
-- 
1.6.3

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