linux-kernel - [PATCH 02/20] fat_dir_ioctl(): hadn't needed that access

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Message-Id: <20200509234557.1124086-2-viro@ZenIV.linux.org.uk>
Date:   Sun, 10 May 2020 00:45:39 +0100
From:   Al Viro <viro@...IV.linux.org.uk>
To:     linux-kernel@...r.kernel.org
Cc:     Linus Torvalds <torvalds@...ux-foundation.org>,
        linux-fsdevel@...r.kernel.org
Subject: [PATCH 02/20] fat_dir_ioctl(): hadn't needed that access_ok() for more than a decade...

From: Al Viro <viro@...iv.linux.org.uk>

address is passed only to put_user() and copy_to_user()

Signed-off-by: Al Viro <viro@...iv.linux.org.uk>
---
 fs/fat/dir.c | 4 ----
 1 file changed, 4 deletions(-)

diff --git a/fs/fat/dir.c b/fs/fat/dir.c
index 054acd9fd033..b4ddf48fa444 100644
--- a/fs/fat/dir.c
+++ b/fs/fat/dir.c
@@ -804,8 +804,6 @@ static long fat_dir_ioctl(struct file *filp, unsigned int cmd,
 		return fat_generic_ioctl(filp, cmd, arg);
 	}
 
-	if (!access_ok(d1, sizeof(struct __fat_dirent[2])))
-		return -EFAULT;
 	/*
 	 * Yes, we don't need this put_user() absolutely. However old
 	 * code didn't return the right value. So, app use this value,
@@ -844,8 +842,6 @@ static long fat_compat_dir_ioctl(struct file *filp, unsigned cmd,
 		return fat_generic_ioctl(filp, cmd, (unsigned long)arg);
 	}
 
-	if (!access_ok(d1, sizeof(struct compat_dirent[2])))
-		return -EFAULT;
 	/*
 	 * Yes, we don't need this put_user() absolutely. However old
 	 * code didn't return the right value. So, app use this value,
-- 
2.11.0