[PATCH AUTOSEL 4.9 19/30] bus/fsl_mc: Do not rely on caller to provide non NULL mc_io

From: Sasha Levin
Date: Mon Oct 26 2020 - 20:16:17 EST


From: Diana Craciun <diana.craciun@xxxxxxxxxxx>

[ Upstream commit 5026cf605143e764e1785bbf9158559d17f8d260 ]

Before destroying the mc_io, check first that it was
allocated.

Reviewed-by: Laurentiu Tudor <laurentiu.tudor@xxxxxxx>
Acked-by: Laurentiu Tudor <laurentiu.tudor@xxxxxxx>
Signed-off-by: Diana Craciun <diana.craciun@xxxxxxxxxxx>
Link: https://lore.kernel.org/r/20200929085441.17448-11-diana.craciun@xxxxxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
drivers/staging/fsl-mc/bus/mc-io.c | 7 ++++++-
1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/drivers/staging/fsl-mc/bus/mc-io.c b/drivers/staging/fsl-mc/bus/mc-io.c
index 798c965fe2033..3fa6774946fae 100644
--- a/drivers/staging/fsl-mc/bus/mc-io.c
+++ b/drivers/staging/fsl-mc/bus/mc-io.c
@@ -167,7 +167,12 @@ int __must_check fsl_create_mc_io(struct device *dev,
*/
void fsl_destroy_mc_io(struct fsl_mc_io *mc_io)
{
- struct fsl_mc_device *dpmcp_dev = mc_io->dpmcp_dev;
+ struct fsl_mc_device *dpmcp_dev;
+
+ if (!mc_io)
+ return;
+
+ dpmcp_dev = mc_io->dpmcp_dev;

if (dpmcp_dev)
fsl_mc_io_unset_dpmcp(mc_io);
--
2.25.1