linux-kernel - [PATCH 4/6] staging: fsl-mc: Fix crash in fsl_mc_device

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Date:	Fri, 27 Mar 2015 16:01:07 -0500
From:	"J. German Rivera" <German.Rivera@...escale.com>
To:	<gregkh@...uxfoundation.org>, <arnd@...db.de>,
	<devel@...verdev.osuosl.org>, <linux-kernel@...r.kernel.org>
CC:	<stuart.yoder@...escale.com>, <Kim.Phillips@...escale.com>,
	<scottwood@...escale.com>, <agraf@...e.de>,
	<bhamciu1@...escale.com>, <R89243@...escale.com>,
	<bhupesh.sharma@...escale.com>, <nir.erez@...escale.com>,
	<richard.schmitt@...escale.com>,
	"J. German Rivera" <German.Rivera@...escale.com>
Subject: [PATCH 4/6] staging: fsl-mc: Fix crash in fsl_mc_device_remove()

Only call fsl_mc_io_destroy() if the DPRC being removed
actually had an mc_io object associated with. Child DPRCs
that have not been bound to the DPRC driver or the VFIO driver
will not have an mc_io associated with them.

Signed-off-by: J. German Rivera <German.Rivera@...escale.com>
---
 drivers/staging/fsl-mc/bus/dprc-driver.c | 9 ++-------
 drivers/staging/fsl-mc/bus/mc-bus.c      | 9 +++++----
 2 files changed, 7 insertions(+), 11 deletions(-)

diff --git a/drivers/staging/fsl-mc/bus/dprc-driver.c b/drivers/staging/fsl-mc/bus/dprc-driver.c
index 9568eea..35c06cf 100644
--- a/drivers/staging/fsl-mc/bus/dprc-driver.c
+++ b/drivers/staging/fsl-mc/bus/dprc-driver.c
@@ -167,7 +167,6 @@ static void dprc_add_new_devices(struct fsl_mc_device *mc_bus_dev,
 
 	for (i = 0; i < num_child_objects_in_mc; i++) {
 		struct fsl_mc_device *child_dev;
-		struct fsl_mc_io *mc_io = NULL;
 		struct dprc_obj_desc *obj_desc = &obj_desc_array[i];
 
 		if (strlen(obj_desc->type) == 0)
@@ -182,14 +181,10 @@ static void dprc_add_new_devices(struct fsl_mc_device *mc_bus_dev,
 			continue;
 		}
 
-		error = fsl_mc_device_add(obj_desc, mc_io, &mc_bus_dev->dev,
+		error = fsl_mc_device_add(obj_desc, NULL, &mc_bus_dev->dev,
 					  &child_dev);
-		if (error < 0) {
-			if (mc_io)
-				fsl_destroy_mc_io(mc_io);
-
+		if (error < 0)
 			continue;
-		}
 	}
 }
 
diff --git a/drivers/staging/fsl-mc/bus/mc-bus.c b/drivers/staging/fsl-mc/bus/mc-bus.c
index de15fa9..d943d99 100644
--- a/drivers/staging/fsl-mc/bus/mc-bus.c
+++ b/drivers/staging/fsl-mc/bus/mc-bus.c
@@ -444,15 +444,16 @@ void fsl_mc_device_remove(struct fsl_mc_device *mc_dev)
 	put_device(&mc_dev->dev);
 
 	if (strcmp(mc_dev->obj_desc.type, "dprc") == 0) {
-		struct fsl_mc_io *mc_io = mc_dev->mc_io;
-
 		mc_bus = to_fsl_mc_bus(mc_dev);
-		fsl_destroy_mc_io(mc_io);
+		if (mc_dev->mc_io) {
+			fsl_destroy_mc_io(mc_dev->mc_io);
+			mc_dev->mc_io = NULL;
+		}
+
 		if (&mc_dev->dev == fsl_mc_bus_type.dev_root)
 			fsl_mc_bus_type.dev_root = NULL;
 	}
 
-	mc_dev->mc_io = NULL;
 	if (mc_bus)
 		devm_kfree(mc_dev->dev.parent, mc_bus);
 	else
-- 
2.3.3

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