linux-kernel - [PATCH] staging: gpib: Fix error code in board_type

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Message-ID: <20250703064633.1955893-1-harshit.m.mogalapalli@oracle.com>
Date: Wed,  2 Jul 2025 23:46:20 -0700
From: Harshit Mogalapalli <harshit.m.mogalapalli@...cle.com>
To: Dave Penkler <dpenkler@...il.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Michael Rubin <matchstick@...erthere.org>,
        Arnd Bergmann <arnd@...db.de>, linux-staging@...ts.linux.dev,
        linux-kernel@...r.kernel.org
Cc: dan.carpenter@...aro.org, kernel-janitors@...r.kernel.org,
        error27@...il.com, harshit.m.mogalapalli@...cle.com
Subject: [PATCH] staging: gpib: Fix error code in board_type_ioctl()

When copy_from_user() fails it return number of bytes it wasn't able to
copy. So the correct return value when copy_from_user() fails is
-EFAULT.

Fixes: 9dde4559e939 ("staging: gpib: Add GPIB common core driver")
Signed-off-by: Harshit Mogalapalli <harshit.m.mogalapalli@...cle.com>
---
This is found using static analysis with Smatch. Only compile tested
---
 drivers/staging/gpib/common/gpib_os.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/staging/gpib/common/gpib_os.c b/drivers/staging/gpib/common/gpib_os.c
index a193d64db033..cd7ea7f4fbae 100644
--- a/drivers/staging/gpib/common/gpib_os.c
+++ b/drivers/staging/gpib/common/gpib_os.c
@@ -831,7 +831,7 @@ static int board_type_ioctl(struct gpib_file_private *file_priv,
 	retval = copy_from_user(&cmd, (void __user *)arg,
 				sizeof(struct gpib_board_type_ioctl));
 	if (retval)
-		return retval;
+		return -EFAULT;
 
 	for (list_ptr = registered_drivers.next; list_ptr != &registered_drivers;
 	     list_ptr = list_ptr->next) {
-- 
2.39.3