[alsa-devel] [PATCH v2 2/2] ALSA: compress: Use memdup_user() rather than duplicating its implementation

[SF Markus Elfring]

From: Markus Elfring <elfring at users.sourceforge.net>
Date: Mon, 22 Aug 2016 10:12:37 +0200

Reuse existing functionality from memdup_user() instead of keeping
duplicate source code.

This issue was detected by using the Coccinelle software.

Signed-off-by: Markus Elfring <elfring at users.sourceforge.net>
---
 sound/core/compress_offload.c | 10 +++-------
 1 file changed, 3 insertions(+), 7 deletions(-)

diff --git a/sound/core/compress_offload.c b/sound/core/compress_offload.c
index a10d139..786989b 100644
--- a/sound/core/compress_offload.c
+++ b/sound/core/compress_offload.c
@@ -554,13 +554,9 @@ snd_compr_set_params(struct snd_compr_stream *stream, unsigned long arg)
 	 * we should allow parameter change only when stream has been
 	 * opened not in other cases
 	 */
-	params = kmalloc(sizeof(*params), GFP_KERNEL);
-	if (!params)
-		return -ENOMEM;
-	if (copy_from_user(params, (void __user *)arg, sizeof(*params))) {
-		retval = -EFAULT;
-		goto out;
-	}
+	params = memdup_user((void __user *)arg, sizeof(*params));
+	if (IS_ERR(params))
+		return PTR_ERR(params);
 
 	retval = snd_compress_check_input(params);
 	if (retval)
-- 
2.9.3