Commit 3c235a33 authored by Li Zefan's avatar Li Zefan Committed by Ingo Molnar
Browse files

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



Leave the last slot for the tailing '\0'.
Signed-off-by: default avatarLi Zefan <lizf@cn.fujitsu.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
LKML-Reference: <4AB865FA.5080801@cn.fujitsu.com>
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
parent b8c7f1dc
...@@ -415,7 +415,7 @@ int trace_get_user(struct trace_parser *parser, const char __user *ubuf, ...@@ -415,7 +415,7 @@ int trace_get_user(struct trace_parser *parser, const char __user *ubuf,
/* read the non-space input */ /* read the non-space input */
while (cnt && !isspace(ch)) { while (cnt && !isspace(ch)) {
if (parser->idx < parser->size) if (parser->idx < parser->size - 1)
parser->buffer[parser->idx++] = ch; parser->buffer[parser->idx++] = ch;
else { else {
ret = -EINVAL; ret = -EINVAL;
......
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