linux-kernel - [PATCH -next] scsi: aacraid: Use memdup

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Message-ID: <1587524232-118733-1-git-send-email-zou_wei@huawei.com>
Date:   Wed, 22 Apr 2020 10:57:12 +0800
From:   Zou Wei <zou_wei@...wei.com>
To:     <aacraid@...rosemi.com>, <jejb@...ux.ibm.com>,
        <martin.petersen@...cle.com>
CC:     <linux-scsi@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        Zou Wei <zou_wei@...wei.com>
Subject: [PATCH -next] scsi: aacraid: Use memdup_user() as a cleanup

Fix coccicheck warning which recommends to use memdup_user().

This patch fixes the following coccicheck warnings:

drivers/scsi/aacraid/commctrl.c:516:15-22: WARNING opportunity for memdup_user

Fixes: 4645df1035b3 ("[PATCH] aacraid: swapped kmalloc args.")
Reported-by: Hulk Robot <hulkci@...wei.com>
Signed-off-by: Zou Wei <zou_wei@...wei.com>
---
 drivers/scsi/aacraid/commctrl.c | 14 +++-----------
 1 file changed, 3 insertions(+), 11 deletions(-)

diff --git a/drivers/scsi/aacraid/commctrl.c b/drivers/scsi/aacraid/commctrl.c
index ffe41bc..1ce1620 100644
--- a/drivers/scsi/aacraid/commctrl.c
+++ b/drivers/scsi/aacraid/commctrl.c
@@ -513,17 +513,9 @@ static int aac_send_raw_srb(struct aac_dev* dev, void __user * arg)
 		goto cleanup;
 	}
 
-	user_srbcmd = kmalloc(fibsize, GFP_KERNEL);
-	if (!user_srbcmd) {
-		dprintk((KERN_DEBUG"aacraid: Could not make a copy of the srb\n"));
-		rcode = -ENOMEM;
-		goto cleanup;
-	}
-	if(copy_from_user(user_srbcmd, user_srb,fibsize)){
-		dprintk((KERN_DEBUG"aacraid: Could not copy srb from user\n"));
-		rcode = -EFAULT;
-		goto cleanup;
-	}
+	user_srbcmd = memdup_user(user_srb, fibsize);
+	if (IS_ERR(user_srbcmd))
+		return PTR_ERR(user_srbcmd);
 
 	flags = user_srbcmd->flags; /* from user in cpu order */
 	switch (flags & (SRB_DataIn | SRB_DataOut)) {
-- 
2.6.2