ftrace: replace simple_strtoul with strict_strtoul

Andrew Morton suggested using strict_strtoul over simple_strtoul.
This patch replaces them in ftrace.

Signed-off-by: Steven Rostedt <srostedt@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

1 files changed, 22 insertions, 6 deletions

diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index 0a367362ba2f..290e9da7aa9a 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -92,9 +92,16 @@ void trace_wake_up(void)
 
 static int __init set_nr_entries(char *str)
 {
+        unsigned long nr_entries;
+        int ret;
+
         if (!str)
                 return 0;
-        trace_nr_entries = simple_strtoul(str, &str, 0);
+        ret = strict_strtoul(str, 0, &nr_entries);
+        /* nr_entries can not be zero */
+        if (ret < 0 || nr_entries == 0)
+                return 0;
+        trace_nr_entries = nr_entries;
         return 1;
 }
 __setup("trace_entries=", set_nr_entries);
@@ -1995,8 +2002,9 @@ tracing_ctrl_write(struct file *filp, const char __user *ubuf,
                    size_t cnt, loff_t *ppos)
 {
         struct trace_array *tr = filp->private_data;
-        long val;
         char buf[64];
+        long val;
+        int ret;
 
         if (cnt >= sizeof(buf))
                 return -EINVAL;
@@ -2006,7 +2014,9 @@ tracing_ctrl_write(struct file *filp, const char __user *ubuf,
 
         buf[cnt] = 0;
 
-        val = simple_strtoul(buf, NULL, 10);
+        ret = strict_strtoul(buf, 10, &val);
+        if (ret < 0)
+                return ret;
 
         val = !!val;
 
@@ -2110,8 +2120,9 @@ tracing_max_lat_write(struct file *filp, const char __user *ubuf,
                       size_t cnt, loff_t *ppos)
 {
         long *ptr = filp->private_data;
-        long val;
         char buf[64];
+        long val;
+        int ret;
 
         if (cnt >= sizeof(buf))
                 return -EINVAL;
@@ -2121,7 +2132,9 @@ tracing_max_lat_write(struct file *filp, const char __user *ubuf,
 
         buf[cnt] = 0;
 
-        val = simple_strtoul(buf, NULL, 10);
+        ret = strict_strtoul(buf, 10, &val);
+        if (ret < 0)
+                return ret;
 
         *ptr = val * 1000;
 
@@ -2376,6 +2389,7 @@ tracing_entries_write(struct file *filp, const char __user *ubuf,
 {
         unsigned long val;
         char buf[64];
+        int ret;
 
         if (cnt >= sizeof(buf))
                 return -EINVAL;
@@ -2385,7 +2399,9 @@ tracing_entries_write(struct file *filp, const char __user *ubuf,
 
         buf[cnt] = 0;
 
-        val = simple_strtoul(buf, NULL, 10);
+        ret = strict_strtoul(buf, 10, &val);
+        if (ret < 0)
+                return ret;
 
         /* must have at least 1 entry */
         if (!val)