linux-kernel - [PATCH -next] ide: Use memdup

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Date:   Wed, 22 Apr 2020 10:59:41 +0800
From:   Zou Wei <zou_wei@...wei.com>
To:     <davem@...emloft.net>
CC:     <linux-ide@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        Zou Wei <zou_wei@...wei.com>
Subject: [PATCH -next] ide: Use memdup_user() as a cleanup

Fix coccicheck warning which recommends to use memdup_user().

This patch fixes the following coccicheck warnings:

drivers/ide/ide-taskfile.c:492:11-18: WARNING opportunity for memdup_user
drivers/ide/ide-taskfile.c:505:10-17: WARNING opportunity for memdup_user

Reported-by: Hulk Robot <hulkci@...wei.com>
Signed-off-by: Zou Wei <zou_wei@...wei.com>
---
 drivers/ide/ide-taskfile.c | 24 ++++++------------------
 1 file changed, 6 insertions(+), 18 deletions(-)

diff --git a/drivers/ide/ide-taskfile.c b/drivers/ide/ide-taskfile.c
index aab6a10..336b575 100644
--- a/drivers/ide/ide-taskfile.c
+++ b/drivers/ide/ide-taskfile.c
@@ -489,28 +489,16 @@ int ide_taskfile_ioctl(ide_drive_t *drive, unsigned long arg)
 
 	if (taskout) {
 		int outtotal = tasksize;
-		outbuf = kzalloc(taskout, GFP_KERNEL);
-		if (outbuf == NULL) {
-			err = -ENOMEM;
-			goto abort;
-		}
-		if (copy_from_user(outbuf, buf + outtotal, taskout)) {
-			err = -EFAULT;
-			goto abort;
-		}
+		outbuf = memdup_user(buf + outtotal, taskout);
+		if (IS_ERR(outbuf))
+			return PTR_ERR(outbuf);
 	}
 
 	if (taskin) {
 		int intotal = tasksize + taskout;
-		inbuf = kzalloc(taskin, GFP_KERNEL);
-		if (inbuf == NULL) {
-			err = -ENOMEM;
-			goto abort;
-		}
-		if (copy_from_user(inbuf, buf + intotal, taskin)) {
-			err = -EFAULT;
-			goto abort;
-		}
+		inbuf = memdup_user(buf + intotal, taskin);
+		if (IS_ERR(inbuf))
+			return PTR_ERR(inbuf);
 	}
 
 	memset(&cmd, 0, sizeof(cmd));
-- 
2.6.2