linux-kernel - [PATCH 4.14 29/53] intel_th: gth: Fix an off-by-one in output unassigning

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Message-Id: <20190430113556.353779668@linuxfoundation.org>
Date:   Tue, 30 Apr 2019 13:38:36 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>
Subject: [PATCH 4.14 29/53] intel_th: gth: Fix an off-by-one in output unassigning

From: Alexander Shishkin <alexander.shishkin@...ux.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@...ux.intel.com>
Fixes: 9ed3f22223c3 ("intel_th: Don't reference unassigned outputs")
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.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
@@ -624,7 +624,7 @@ 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);