patch "uio: fix wrong return value from uio_mmap()" added to char-misc-next

patch "uio: fix wrong return value from uio_mmap()" added to char-misc-next

[gregkh]

This is a note to let you know that I've just added the patch titled

    uio: fix wrong return value from uio_mmap()

to my char-misc git tree which can be found at
    git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc.git
in the char-misc-next branch.

The patch will show up in the next release of the linux-next tree
(usually sometime within the next 24 hours during the week.)

The patch will also be merged in the next major kernel release
during the merge window.

If you have any questions about this process, please let me know.


>From e7de2590f18a272e63732b9d519250d1b522b2c4 Mon Sep 17 00:00:00 2001
From: Hailong Liu <liu.hailong6@zte.com.cn>
Date: Fri, 20 Jul 2018 08:31:56 +0800
Subject: uio: fix wrong return value from uio_mmap()

uio_mmap has multiple fail paths to set return value to nonzero then
goto out. However, it always returns *0* from the *out* at end, and
this will mislead callers who check the return value of this function.

Fixes: 57c5f4df0a5a0ee ("uio: fix crash after the device is unregistered")
CC: Xiubo Li <xiubli@redhat.com>
Signed-off-by: Hailong Liu <liu.hailong6@zte.com.cn>
Cc: stable <stable@vger.kernel.org>
Signed-off-by: Jiang Biao <jiang.biao2@zte.com.cn>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/uio/uio.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/uio/uio.c b/drivers/uio/uio.c
index f63967c8e95a..144cf7365288 100644
--- a/drivers/uio/uio.c
+++ b/drivers/uio/uio.c
@@ -813,7 +813,7 @@ static int uio_mmap(struct file *filep, struct vm_area_struct *vma)
 
 out:
 	mutex_unlock(&idev->info_lock);
-	return 0;
+	return ret;
 }
 
 static const struct file_operations uio_fops = {
-- 
2.18.0