linux-kernel - [PATCH 4.14 55/59] floppy: fix usercopy direction

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Date:   Fri, 20 Sep 2019 00:04:10 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Alexander Popov <alex.popov@...ux.com>,
        Mukesh Ojha <mojha@...eaurora.org>,
        Jann Horn <jannh@...gle.com>, Jens Axboe <axboe@...nel.dk>
Subject: [PATCH 4.14 55/59] floppy: fix usercopy direction

From: Jann Horn <jannh@...gle.com>

commit 52f6f9d74f31078964ca1574f7bb612da7877ac8 upstream.

As sparse points out, these two copy_from_user() should actually be
copy_to_user().

Fixes: 229b53c9bf4e ("take floppy compat ioctls to sodding floppy.c")
Cc: stable@...r.kernel.org
Acked-by: Alexander Popov <alex.popov@...ux.com>
Reviewed-by: Mukesh Ojha <mojha@...eaurora.org>
Signed-off-by: Jann Horn <jannh@...gle.com>
Signed-off-by: Jens Axboe <axboe@...nel.dk>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/block/floppy.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/drivers/block/floppy.c
+++ b/drivers/block/floppy.c
@@ -3786,7 +3786,7 @@ static int compat_getdrvprm(int drive,
 	v.native_format = UDP->native_format;
 	mutex_unlock(&floppy_mutex);
 
-	if (copy_from_user(arg, &v, sizeof(struct compat_floppy_drive_params)))
+	if (copy_to_user(arg, &v, sizeof(struct compat_floppy_drive_params)))
 		return -EFAULT;
 	return 0;
 }
@@ -3822,7 +3822,7 @@ static int compat_getdrvstat(int drive,
 	v.bufblocks = UDRS->bufblocks;
 	mutex_unlock(&floppy_mutex);
 
-	if (copy_from_user(arg, &v, sizeof(struct compat_floppy_drive_struct)))
+	if (copy_to_user(arg, &v, sizeof(struct compat_floppy_drive_struct)))
 		return -EFAULT;
 	return 0;
 Eintr: