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    Subject[PATCH] Fix NULL handler for compat_ioctl
    Pretty serious ommision, but I'm guessing there's not too many users of
    the {un,}register_ioctl32_conversion calls. Linux1394 just happens to
    use it quite extensively, so this showed up on my radar by coincidence.

    You are supposed to be able to pass a NULL handler to
    register_ioctl32_conversion to signify a compatible translation, IOW,
    use the 64-bit ioctl handler. Without this patch, we would instead jump
    to a NULL address.

    Applies to current 2.5.68-bk (see Larry, someone is using bk-cvs for
    something good :).

    diff -u -u -r1.8 compat.c
    --- linux/fs/compat.c 30 Apr 2003 16:17:21 -0000 1.8
    +++ linux/fs/compat.c 1 May 2003 01:45:46 -0000
    @@ -229,7 +229,10 @@

    t->next = NULL;
    t->cmd = cmd;
    - t->handler = handler;
    + if (!handler)
    + t->handler = (void *)sys_ioctl;
    + else
    + t->handler = handler;

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