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From: Alan Tull <atull@kernel.org>
To: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Moritz Fischer <mdf@kernel.org>, Alan Tull <atull@kernel.org>,
	linux-kernel@vger.kernel.org, linux-fpga@vger.kernel.org
Subject: [PATCH 1/5] fpga: do not access region struct after fpga_region_unregister
Date: Wed, 12 Sep 2018 09:43:23 -0500
Message-ID: <20180912144327.3130-2-atull@kernel.org> (raw)
In-Reply-To: <20180912144327.3130-1-atull@kernel.org>

A couple drivers were accessing the region struct after it had been
freed.  Save off the pointer to the mgr before the region struct gets
freed.

Signed-off-by: Alan Tull <atull@kernel.org>
Acked-by: Moritz Fischer <mdf@kernel.org>
---
 drivers/fpga/dfl-fme-region.c | 4 +++-
 drivers/fpga/of-fpga-region.c | 3 ++-
 2 files changed, 5 insertions(+), 2 deletions(-)

diff --git a/drivers/fpga/dfl-fme-region.c b/drivers/fpga/dfl-fme-region.c
index 0b7e19c..51a5ac2 100644
--- a/drivers/fpga/dfl-fme-region.c
+++ b/drivers/fpga/dfl-fme-region.c
@@ -14,6 +14,7 @@
  */
 
 #include <linux/module.h>
+#include <linux/fpga/fpga-mgr.h>
 #include <linux/fpga/fpga-region.h>
 
 #include "dfl-fme-pr.h"
@@ -66,9 +67,10 @@ static int fme_region_probe(struct platform_device *pdev)
 static int fme_region_remove(struct platform_device *pdev)
 {
 	struct fpga_region *region = dev_get_drvdata(&pdev->dev);
+	struct fpga_manager *mgr = region->mgr;
 
 	fpga_region_unregister(region);
-	fpga_mgr_put(region->mgr);
+	fpga_mgr_put(mgr);
 
 	return 0;
 }
diff --git a/drivers/fpga/of-fpga-region.c b/drivers/fpga/of-fpga-region.c
index 35fabb8..052a134 100644
--- a/drivers/fpga/of-fpga-region.c
+++ b/drivers/fpga/of-fpga-region.c
@@ -437,9 +437,10 @@ static int of_fpga_region_probe(struct platform_device *pdev)
 static int of_fpga_region_remove(struct platform_device *pdev)
 {
 	struct fpga_region *region = platform_get_drvdata(pdev);
+	struct fpga_manager *mgr = region->mgr;
 
 	fpga_region_unregister(region);
-	fpga_mgr_put(region->mgr);
+	fpga_mgr_put(mgr);
 
 	return 0;
 }
-- 
2.7.4

  reply index

Thread overview: 12+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-09-12 14:43 [PATCH 0/5] fpga: patches for v4.19 Alan Tull
2018-09-12 14:43 ` Alan Tull [this message]
2018-09-12 14:43 ` [PATCH 2/5] fpga: bridge: fix obvious function documentation error Alan Tull
2018-09-12 14:43 ` [PATCH 3/5] docs: fpga: document fpga manager flags Alan Tull
2018-09-12 14:43 ` [PATCH 4/5] fpga: of-fpga-region: Use platform_set_drvdata Alan Tull
2018-09-30 15:49   ` Greg Kroah-Hartman
2018-11-12 15:48     ` Alan Tull
2018-09-12 14:43 ` [PATCH 5/5] fpga: dfl-fme-region: Use platform_get_drvdata() Alan Tull
2018-09-30 15:48   ` Greg Kroah-Hartman
2018-11-12 15:46     ` Alan Tull
2018-11-12 18:02       ` Greg Kroah-Hartman
2018-11-12 19:39         ` Alan Tull

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