linux-kernel - [PATCH v6 3/4] ipmi: ssif_bmc: Return -EFAULT if copy_from

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Date:   Thu, 10 Mar 2022 18:41:18 +0700
From:   Quan Nguyen <quan@...amperecomputing.com>
To:     Corey Minyard <minyard@....org>, Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>,
        Joel Stanley <joel@....id.au>,
        Andrew Jeffery <andrew@...id.au>,
        Brendan Higgins <brendanhiggins@...gle.com>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Wolfram Sang <wsa@...nel.org>,
        openipmi-developer@...ts.sourceforge.net,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-aspeed@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
        linux-i2c@...r.kernel.org, openbmc@...ts.ozlabs.org
Cc:     Open Source Submission <patches@...erecomputing.com>,
        Phong Vo <phong@...amperecomputing.com>,
        "Thang Q . Nguyen" <thang@...amperecomputing.com>
Subject: [PATCH v6 3/4] ipmi: ssif_bmc: Return -EFAULT if copy_from_user() fails

From: Dan Carpenter <dan.carpenter@...cle.com>

The copy_from_user() function returns the number of bytes remaining to
be copied but we should return -EFAULT here.

Fixes: 501c25b59508 ("ipmi: ssif_bmc: Add SSIF BMC driver")
Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>
Signed-off-by: Corey Minyard <cminyard@...sta.com>
Signed-off-by: Quan Nguyen <quan@...amperecomputing.com>
---
v6:
  + New add in v6, thanks Dan for the patch     [Dan]

 drivers/char/ipmi/ssif_bmc.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/drivers/char/ipmi/ssif_bmc.c b/drivers/char/ipmi/ssif_bmc.c
index 62db97773654..91ac2cae756e 100644
--- a/drivers/char/ipmi/ssif_bmc.c
+++ b/drivers/char/ipmi/ssif_bmc.c
@@ -87,9 +87,8 @@ static ssize_t ssif_bmc_write(struct file *file, const char __user *buf, size_t
 	if (count > sizeof(struct ssif_msg))
 		return -EINVAL;
 
-	ret = copy_from_user(&msg, buf, count);
-	if (ret)
-		return ret;
+	if (copy_from_user(&msg, buf, count))
+		return -EFAULT;
 
 	if (!msg.len || count < ssif_msg_len(&msg))
 		return -EINVAL;
-- 
2.35.1