From: Markus Elfring <elfring@users.sourceforge.net>
Date: Sun, 21 Aug 2016 19:02:06 +0000 (+0200)
Subject: ALSA: compress: Use memdup_user() rather than duplicating its implementation
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=c2f14ba749c1ce94aa97c5a84733a89aaaadada4;p=GitHub%2FLineageOS%2Fandroid_kernel_motorola_exynos9610.git

ALSA: compress: Use memdup_user() rather than duplicating its implementation

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@users.sourceforge.net>
Acked-by: Vinod Koul <vinod.koul@intel.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
---

diff --git a/sound/core/compress_offload.c b/sound/core/compress_offload.c
index 2c498488af6c..583d4076903a 100644
--- a/sound/core/compress_offload.c
+++ b/sound/core/compress_offload.c
@@ -553,13 +553,9 @@ 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)