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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>
This commit is contained in:
Li Zefan 2009-07-07 13:54:08 +08:00 committed by Ingo Molnar
parent 92cf9f8f7e
commit 011ed56853
1 changed files with 2 additions and 5 deletions
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7
kernel/trace/trace_ksym.c
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@ -264,11 +264,7 @@ static ssize_t ksym_trace_filter_write(struct file *file,
unsigned long ksym_addr = 0; unsigned long ksym_addr = 0;
int ret, op, changed = 0; int ret, op, changed = 0;
/* Ignore echo "" > ksym_trace_filter */ input_string = kzalloc(count + 1, GFP_KERNEL);
if (count == 0)
return 0;
input_string = kzalloc(count, GFP_KERNEL);
if (!input_string) if (!input_string)
return -ENOMEM; return -ENOMEM;
@ -276,6 +272,7 @@ static ssize_t ksym_trace_filter_write(struct file *file,
kfree(input_string); kfree(input_string);
return -EFAULT; return -EFAULT;
} }
input_string[count] = '\0';
ret = op = parse_ksym_trace_str(input_string, &ksymname, &ksym_addr); ret = op = parse_ksym_trace_str(input_string, &ksymname, &ksym_addr);
if (ret < 0) { if (ret < 0) {