[tip:tracing/urgent] tracing: Fix off-by-one in trace_get_user()

[tip-bot for Li Zefan]

Commit-ID:  3c235a337e205da0f614e456be72881483dcde6e
Gitweb:     http://git.kernel.org/tip/3c235a337e205da0f614e456be72881483dcde6e
Author:     Li Zefan <lizf@xxxxxxxxxxxxxx>
AuthorDate: Tue, 22 Sep 2009 13:51:54 +0800
Committer:  Ingo Molnar <mingo@xxxxxxx>
CommitDate: Tue, 22 Sep 2009 10:28:53 +0200

tracing: Fix off-by-one in trace_get_user()

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

Signed-off-by: Li Zefan <lizf@xxxxxxxxxxxxxx>
Cc: Frederic Weisbecker <fweisbec@xxxxxxxxx>
Cc: Jiri Olsa <jolsa@xxxxxxxxxx>
Cc: Steven Rostedt <rostedt@xxxxxxxxxxx>
LKML-Reference: <4AB865FA.5080801@xxxxxxxxxxxxxx>
Signed-off-by: Ingo Molnar <mingo@xxxxxxx>


---
 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;
--
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