ASoC: SOF: ipc3-dtrace: Switch to memdup_user_nul() helper

Use memdup_user_nul() helper instead of open-coding to
simplify the code.

Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>
Link: https://lore.kernel.org/r/20230725120247.509422-1-yangyingliang@huawei.com
Signed-off-by: Mark Brown <broonie@kernel.org>

diff --git a/sound/soc/sof/ipc3-dtrace.c b/sound/soc/sof/ipc3-dtrace.c
index 35da85a45a9aeded73a21bfcfeda4233999d144c..bd07f0472efd719b99df5cd9afd9bced1318bedc 100644 (file)
--- a/sound/soc/sof/ipc3-dtrace.c
+++ b/sound/soc/sof/ipc3-dtrace.c
@@ -196,15 +196,9 @@ static ssize_t dfsentry_trace_filter_write(struct file *file, const char __user
                return -EINVAL;
        }
 
-       string = kmalloc(count + 1, GFP_KERNEL);
-       if (!string)
-               return -ENOMEM;
-
-       if (copy_from_user(string, from, count)) {
-               ret = -EFAULT;
-               goto error;
-       }
-       string[count] = '\0';
+       string = memdup_user_nul(from, count);
+       if (IS_ERR(string))
+               return PTR_ERR(string);
 
        ret = trace_filter_parse(sdev, string, &num_elems, &elems);
        if (ret < 0)