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    Subject[PATCH 4.9 157/245] fuse: reject internal errno
    Date
    From: Miklos Szeredi <mszeredi@redhat.com>

    commit 49221cf86d18bb66fe95d3338cb33bd4b9880ca5 upstream.

    Don't allow userspace to report errors that could be kernel-internal.

    Reported-by: Anatoly Trosinenko <anatoly.trosinenko@gmail.com>
    Fixes: 334f485df85a ("[PATCH] FUSE - device functions")
    Cc: <stable@vger.kernel.org> # v2.6.14
    Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

    ---
    fs/fuse/dev.c | 2 +-
    1 file changed, 1 insertion(+), 1 deletion(-)

    --- a/fs/fuse/dev.c
    +++ b/fs/fuse/dev.c
    @@ -1883,7 +1883,7 @@ static ssize_t fuse_dev_do_write(struct
    }

    err = -EINVAL;
    - if (oh.error <= -1000 || oh.error > 0)
    + if (oh.error <= -512 || oh.error > 0)
    goto err_finish;

    spin_lock(&fpq->lock);

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