linux-kernel - [PATCH] ipmi: ssif_bmc: Return -EFAULT if copy_from

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Date:   Fri, 23 Jul 2021 11:44:59 +0300
From:   Dan Carpenter <dan.carpenter@...cle.com>
To:     Corey Minyard <minyard@....org>
Cc:     Quan Nguyen <quan@...amperecomputing.com>,
        openipmi-developer@...ts.sourceforge.net,
        linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: [PATCH] ipmi: ssif_bmc: Return -EFAULT if copy_from_user() fails

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

Fixes: 007888f365c9 ("ipmi: ssif_bmc: Add SSIF BMC driver")
Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>
---
 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 b15c05622e72..ce8cd8364a3f 100644
--- a/drivers/char/ipmi/ssif_bmc.c
+++ b/drivers/char/ipmi/ssif_bmc.c
@@ -85,9 +85,8 @@ 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;
-- 
2.20.1