diff options
| author | Li Zefan <lizf@cn.fujitsu.com> | 2009-07-07 13:54:08 +0800 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2009-07-10 11:59:42 +0200 |
| commit | 011ed56853e07e30653d6f1bfddc56b396218664 (patch) | |
| tree | a172911c83f2a0f9ae23a5d160860827929d60f9 /kernel/trace/trace_ksym.c | |
| parent | 92cf9f8f7e89c6bdbb1a724f879b8b18fc0dfe0f (diff) | |
ksym_tracer: NIL-terminate user input filter
Make sure the user input string is NULL-terminated.
Signed-off-by: Li Zefan <lizf@cn.fujitsu.com>
Acked-by: Frederic Weisbecker <fweisbec@gmail.com>
Cc: "K.Prasad" <prasad@linux.vnet.ibm.com>
Cc: Alan Stern <stern@rowland.harvard.edu>
Cc: Steven Rostedt <rostedt@goodmis.org>
LKML-Reference: <4A52E300.7020601@cn.fujitsu.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'kernel/trace/trace_ksym.c')
| -rw-r--r-- | kernel/trace/trace_ksym.c | 7 |
1 files changed, 2 insertions, 5 deletions
diff --git a/kernel/trace/trace_ksym.c b/kernel/trace/trace_ksym.c index 72fcb46c39c..8cbed5a6286 100644 --- a/kernel/trace/trace_ksym.c +++ b/kernel/trace/trace_ksym.c @@ -264,11 +264,7 @@ static ssize_t ksym_trace_filter_write(struct file *file, unsigned long ksym_addr = 0; int ret, op, changed = 0; - /* Ignore echo "" > ksym_trace_filter */ - if (count == 0) - return 0; - - input_string = kzalloc(count, GFP_KERNEL); + input_string = kzalloc(count + 1, GFP_KERNEL); if (!input_string) return -ENOMEM; @@ -276,6 +272,7 @@ static ssize_t ksym_trace_filter_write(struct file *file, kfree(input_string); return -EFAULT; } + input_string[count] = '\0'; ret = op = parse_ksym_trace_str(input_string, &ksymname, &ksym_addr); if (ret < 0) { |