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tracing: Don't use the address of the buffer array name in copy_from_user 

With the following code snippet:

    ...
    char buf[64];
    ...
    if (copy_from_user(&buf, ubuf, cnt))
    ...

Even though the value of "&buf" equals "buf", but there is no need
to get the address of the "buf" again. Use "buf" instead of "&buf".

Link: http://lkml.kernel.org/r/20160418152329.18b72bea@debian

Signed-off-by: Wang Xiaoqiang <wangxq10@lzu.edu.cn>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
This commit is contained in:
Wang Xiaoqiang 2016-04-18 15:23:29 +08:00 committed by Steven Rostedt
parent 6e4cf657de
commit 4afe6495e5
1 changed files with 3 additions and 3 deletions
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6
kernel/trace/trace.c
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@ -3664,7 +3664,7 @@ tracing_trace_options_write(struct file *filp, const char __user *ubuf,
if (cnt >= sizeof(buf))
return -EINVAL;
if (copy_from_user(&buf, ubuf, cnt))
if (copy_from_user(buf, ubuf, cnt))
return -EFAULT;
buf[cnt] = 0;
@ -4537,7 +4537,7 @@ tracing_set_trace_write(struct file *filp, const char __user *ubuf,
if (cnt > MAX_TRACER_SIZE)
cnt = MAX_TRACER_SIZE;
if (copy_from_user(&buf, ubuf, cnt))
if (copy_from_user(buf, ubuf, cnt))
return -EFAULT;
buf[cnt] = 0;
@ -5327,7 +5327,7 @@ static ssize_t tracing_clock_write(struct file *filp, const char __user *ubuf,
if (cnt >= sizeof(buf))
return -EINVAL;
if (copy_from_user(&buf, ubuf, cnt))
if (copy_from_user(buf, ubuf, cnt))
return -EFAULT;
buf[cnt] = 0;