linux-kernel - [PATCH] staging: spectra: Use memdup

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Date:	Sat, 13 Aug 2011 10:48:57 +0200
From:	Thomas Meyer <thomas@...3r.de>
To:	gregkh@...e.de, devel@...verdev.osuosl.org,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: [PATCH] staging: spectra: Use memdup_user

From: Thomas Meyer <thomas@...3r.de>

 Use kmemdup_user rather than duplicating its implementation
 This is a little bit restricted to reduce false positives

 The semantic patch that makes this output is available
 in scripts/coccinelle/api/memdup_user.cocci.

 More information about semantic patching is available at
 http://coccinelle.lip6.fr/

Signed-off-by: Thomas Meyer <thomas@...3r.de>
---

diff --git a/drivers/staging/spectra/ffsport.c b/drivers/staging/spectra/ffsport.c
index 506547b..86d556d 100644
--- a/drivers/staging/spectra/ffsport.c
+++ b/drivers/staging/spectra/ffsport.c
@@ -227,19 +227,12 @@ static int ioctl_write_page_data(unsigned long arg)
 	if (copy_from_user(&info, (void __user *)arg, sizeof(info)))
 		return -EFAULT;
 
-	buf = kmalloc(IdentifyDeviceData.PageDataSize, GFP_ATOMIC);
-	if (!buf) {
-		printk(KERN_ERR "ioctl_write_page_data: "
-		       "failed to allocate memory\n");
-		return -ENOMEM;
-	}
-
-	if (copy_from_user(buf, (void __user *)info.data,
-			   IdentifyDeviceData.PageDataSize)) {
+	buf = memdup_user((void __user *)info.data,
+			  IdentifyDeviceData.PageDataSize);
+	if (IS_ERR(buf)) {
 		printk(KERN_ERR "ioctl_write_page_data: "
 		       "failed to copy user data\n");
-		kfree(buf);
-		return -EFAULT;
+		return PTR_ERR(buf);
 	}
 
 	mutex_lock(&spectra_lock);



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