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uio: fix wrong return value from uio_mmap()

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commit e7de2590f18a272e63732b9d519250d1b522b2c4 upstream.

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>
Signed-off-by: Tommi Rantala <tommi.t.rantala@nokia.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Hailong Liu 2019-02-13 16:29:36 +00:00 committed by Greg Kroah-Hartman
parent 13af019c87
commit 28c618abee
1 changed files with 1 additions and 1 deletions
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2
drivers/uio/uio.c
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@ -816,7 +816,7 @@ 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 = {