linux-kernel - [PATCH 1/1 linux-next] udf: return inappropriate ioctl instead of argument error

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Date:   Thu, 19 Jan 2017 21:41:37 +0100
From:   Fabian Frederick <fabf@...net.be>
To:     Jan Kara <jack@...e.cz>
Cc:     linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        fabf@...net.be
Subject: [PATCH 1/1 linux-next] udf: return inappropriate ioctl instead of argument error

Currently, lsattr for instance in udf directory gives
"udf: Invalid argument While reading flags on ..."

This patch removes argument testing and returns -ENOIOCTLCMD
when command is unknown to have more accurate message like this:
"Inappropriate ioctl for device While reading flags on ..."
If arg is NULL, we return specific operation error anyway.

Signed-off-by: Fabian Frederick <fabf@...net.be>
---
 fs/udf/file.c | 8 ++------
 1 file changed, 2 insertions(+), 6 deletions(-)

diff --git a/fs/udf/file.c b/fs/udf/file.c
index dbcb3a4a..964620b 100644
--- a/fs/udf/file.c
+++ b/fs/udf/file.c
@@ -184,12 +184,6 @@ long udf_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
 		goto out;
 	}
 
-	if (!arg) {
-		udf_debug("invalid argument to udf_ioctl\n");
-		result = -EINVAL;
-		goto out;
-	}
-
 	switch (cmd) {
 	case UDF_GETVOLIDENT:
 		if (copy_to_user((char __user *)arg,
@@ -220,6 +214,8 @@ long udf_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
 				      UDF_I(inode)->i_ext.i_data,
 				      UDF_I(inode)->i_lenEAttr) ? -EFAULT : 0;
 		goto out;
+	default:
+		return -ENOIOCTLCMD;
 	}
 
 out:
-- 
2.9.3