linux-kernel - [PATCH] uio: fix wrong return value from uio

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Date:   Fri, 20 Jul 2018 08:31:56 +0800
From:   Hailong Liu <liu.hailong6@....com.cn>
To:     gregkh@...uxfoundation.org
Cc:     xiubli@...hat.com, linux-kernel@...r.kernel.org,
        jiang.biao2@....com.cn, zhong.weidong@....com.cn,
        Hailong Liu <liu.hailong6@....com.cn>
Subject: [PATCH] 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@...hat.com>
Signed-off-by: Hailong Liu <liu.hailong6@....com.cn>
Signed-off-by: Jiang Biao <jiang.biao2@....com.cn>
---
 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 5d421d7..0ddfda2 100644
--- a/drivers/uio/uio.c
+++ b/drivers/uio/uio.c
@@ -814,7 +814,7 @@ 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 = {
-- 
1.8.3.1