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intel_th: gth: Fix an off-by-one in output unassigning

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commit 91d3f8a629 upstream.

Commit 9ed3f22223 ("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: 9ed3f22223 ("intel_th: Don't reference unassigned outputs")
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Alexander Shishkin
2019-03-01 10:09:55 +02:00
committed by Greg Kroah-Hartman
parent da0bbf51bd
commit 01b6f50f90
1 changed files with 1 additions and 1 deletions
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2
drivers/hwtracing/intel_th/gth.c
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@@ -624,7 +624,7 @@ static void intel_th_gth_unassign(struct intel_th_device *thdev,
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);