[PATCH] bus: fsl-mc: Fix the double free in fsl_mc_device_add()

[Su Hui]

Clang static checker(scan-build) warning：
drivers/bus/fsl-mc/fsl-mc-bus.c: line 909, column 2
Attempt to free released memory.

When 'obj_desc->type' == "dprc" and begin to free 'mc_bus' and 'mc_dev',
there is a double free problem because of 'mc_dev = &mc_bus->mc_dev'.
Add a judgment to fix this problem.

Fixes: a042fbed0290 ("staging: fsl-mc: simplify couple of deallocations")
Signed-off-by: Su Hui <suhui@xxxxxxxxxxxx>
---
 drivers/bus/fsl-mc/fsl-mc-bus.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/bus/fsl-mc/fsl-mc-bus.c b/drivers/bus/fsl-mc/fsl-mc-bus.c
index 930d8a3ba722..8d2d5d3cc782 100644
--- a/drivers/bus/fsl-mc/fsl-mc-bus.c
+++ b/drivers/bus/fsl-mc/fsl-mc-bus.c
@@ -905,8 +905,10 @@ int fsl_mc_device_add(struct fsl_mc_obj_desc *obj_desc,
 
 error_cleanup_dev:
 	kfree(mc_dev->regions);
-	kfree(mc_bus);
-	kfree(mc_dev);
+	if (strcmp(mc_dev->obj_desc.type, "dprc") == 0)
+		kfree(mc_bus);
+	else
+		kfree(mc_dev);
 
 	return error;
 }
-- 
2.30.2