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tracing: Check the return value of trace_get_user() 

Return immediately if trace_get_user() returned failure.

Signed-off-by: Li 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: <4AB86614.7020803@cn.fujitsu.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Li Zefan 2009-09-22 13:52:20 +08:00 committed by Ingo Molnar
parent 3c235a337e
commit 4ba7978e98
2 changed files with 7 additions and 9 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

9
kernel/trace/ftrace.c
View File

@ -2202,7 +2202,7 @@ ftrace_regex_write(struct file *file, const char __user *ubuf,
struct trace_parser *parser;
ssize_t ret, read;
if (!cnt || cnt < 0)
if (!cnt)
return 0;
mutex_lock(&ftrace_regex_lock);
@ -2216,7 +2216,7 @@ ftrace_regex_write(struct file *file, const char __user *ubuf,
parser = &iter->parser;
read = trace_get_user(parser, ubuf, cnt, ppos);
if (trace_parser_loaded(parser) &&
if (read >= 0 && trace_parser_loaded(parser) &&
!trace_parser_cont(parser)) {
ret = ftrace_process_regex(parser->buffer,
parser->idx, enable);
@ -2552,8 +2552,7 @@ ftrace_graph_write(struct file *file, const char __user *ubuf,
size_t cnt, loff_t *ppos)
{
struct trace_parser parser;
size_t read = 0;
ssize_t ret;
ssize_t read, ret;
if (!cnt || cnt < 0)
return 0;
@ -2572,7 +2571,7 @@ ftrace_graph_write(struct file *file, const char __user *ubuf,
read = trace_get_user(&parser, ubuf, cnt, ppos);
if (trace_parser_loaded((&parser))) {
if (read >= 0 && trace_parser_loaded((&parser))) {
parser.buffer[parser.idx] = 0;
/* we allow only one expression at a time */

7
kernel/trace/trace_events.c
View File

@ -232,10 +232,9 @@ ftrace_event_write(struct file *file, const char __user *ubuf,
size_t cnt, loff_t *ppos)
{
struct trace_parser parser;
size_t read = 0;
ssize_t ret;
ssize_t read, ret;
if (!cnt || cnt < 0)
if (!cnt)
return 0;
ret = tracing_update_buffers();
@ -247,7 +246,7 @@ ftrace_event_write(struct file *file, const char __user *ubuf,
read = trace_get_user(&parser, ubuf, cnt, ppos);
if (trace_parser_loaded((&parser))) {
if (read >= 0 && trace_parser_loaded((&parser))) {
int set = 1;
if (*parser.buffer == '!')