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    Subject[PATCH 4.19 053/100] intel_th: gth: Fix an off-by-one in output unassigning
    Date
    From: Alexander Shishkin <alexander.shishkin@linux.intel.com>

    commit 91d3f8a629849968dc91d6ce54f2d46abf4feb7f upstream.

    Commit 9ed3f22223c3 ("intel_th: Don't reference unassigned outputs")
    fixes a NULL dereference for all masters except the last one ("256+"),
    which keeps the stale pointer after the output driver had been unassigned.

    Fix the off-by-one.

    Signed-off-by: Alexander Shishkin <alexander.shishkin@linux.intel.com>
    Fixes: 9ed3f22223c3 ("intel_th: Don't reference unassigned outputs")
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

    ---
    drivers/hwtracing/intel_th/gth.c | 2 +-
    1 file changed, 1 insertion(+), 1 deletion(-)

    --- a/drivers/hwtracing/intel_th/gth.c
    +++ b/drivers/hwtracing/intel_th/gth.c
    @@ -616,7 +616,7 @@ static void intel_th_gth_unassign(struct
    othdev->output.port = -1;
    othdev->output.active = false;
    gth->output[port].output = NULL;
    - for (master = 0; master < TH_CONFIGURABLE_MASTERS; master++)
    + for (master = 0; master <= TH_CONFIGURABLE_MASTERS; master++)
    if (gth->master[master] == port)
    gth->master[master] = -1;
    spin_unlock(&gth->gth_lock);

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