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Commit 011ed568 authored by Li Zefan's avatar Li Zefan Committed by Ingo Molnar
Browse files

ksym_tracer: NIL-terminate user input filter 



Make sure the user input string is NULL-terminated.

Signed-off-by: default avatarLi Zefan <lizf@cn.fujitsu.com>
Acked-by: default avatarFrederic 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: default avatarIngo Molnar <mingo@elte.hu>
parent 92cf9f8f

kernel/trace/trace_ksym.c

+2 −5
Original line number Diff line number Diff line
@@ -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) {