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| author | Li Zefan <lizf@cn.fujitsu.com> | 2009-09-22 13:52:20 +0800 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2009-09-22 10:28:55 +0200 |
| commit | 4ba7978e98a3ff92cebfb0f31a02c309e3ffa1fe (patch) | |
| tree | 47d8b3b0927a7413fabcc634023b45350f344d89 /kernel/trace/ftrace.c | |
| parent | 3c235a337e205da0f614e456be72881483dcde6e (diff) | |
| download | blackbird-op-linux-4ba7978e98a3ff92cebfb0f31a02c309e3ffa1fe.tar.gz blackbird-op-linux-4ba7978e98a3ff92cebfb0f31a02c309e3ffa1fe.zip | |
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>
Diffstat (limited to 'kernel/trace/ftrace.c')
| -rw-r--r-- | kernel/trace/ftrace.c | 9 |
1 files changed, 4 insertions, 5 deletions
diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c index c71e91bf7372..a8fe4782ebad 100644 --- a/kernel/trace/ftrace.c +++ b/kernel/trace/ftrace.c @@ -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 */ |
