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| author | Wang Xiaoqiang <wangxq10@lzu.edu.cn> | 2016-04-18 09:23:29 +0200 |
|---|---|---|
| committer | Steven Rostedt <rostedt@goodmis.org> | 2016-04-26 20:42:03 +0200 |
| commit | 4afe6495e5cb3c352d95f07512cbb227e607e2ce (patch) | |
| tree | 8b3590a165e3b47f70e33d68db9b059769e7ef88 /kernel/trace | |
| parent | tracing: Handle tracing_map_alloc_elts() error path correctly (diff) | |
| download | linux-4afe6495e5cb3c352d95f07512cbb227e607e2ce.tar.xz linux-4afe6495e5cb3c352d95f07512cbb227e607e2ce.zip | |
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>
Diffstat (limited to 'kernel/trace')
| -rw-r--r-- | kernel/trace/trace.c | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c index 5e3ad3481e4b..46028d47d252 100644 --- a/kernel/trace/trace.c +++ b/kernel/trace/trace.c @@ -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; |