From: Eugen Hristev eugen.hristev@microchip.com
commit 1e4e25c4959c10728fbfcc6a286f9503d32dfe02 upstream.
The subsystem will free the asd memory on notifier cleanup, if the asd is added to the notifier. However the memory is freed using kfree. Thus, we cannot allocate the asd using devm_* This can lead to crashes and problems. To test this issue, just return an error at probe, but cleanup the notifier beforehand.
Fixes: 106267444f ("[media] atmel-isc: add the Image Sensor Controller code")
Signed-off-by: Eugen Hristev eugen.hristev@microchip.com Signed-off-by: Hans Verkuil hverkuil-cisco@xs4all.nl Signed-off-by: Mauro Carvalho Chehab mchehab+samsung@kernel.org Signed-off-by: Lee Jones lee.jones@linaro.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- drivers/media/platform/atmel/atmel-isc.c | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-)
--- a/drivers/media/platform/atmel/atmel-isc.c +++ b/drivers/media/platform/atmel/atmel-isc.c @@ -1297,8 +1297,11 @@ static int isc_parse_dt(struct device *d break; }
- subdev_entity->asd = devm_kzalloc(dev, - sizeof(*subdev_entity->asd), GFP_KERNEL); + /* asd will be freed by the subsystem once it's added to the + * notifier list + */ + subdev_entity->asd = kzalloc(sizeof(*subdev_entity->asd), + GFP_KERNEL); if (subdev_entity->asd == NULL) { of_node_put(rem); ret = -ENOMEM; @@ -1432,6 +1435,7 @@ static int atmel_isc_probe(struct platfo &subdev_entity->notifier); if (ret) { dev_err(dev, "fail to register async notifier\n"); + kfree(subdev_entity->asd); goto cleanup_subdev; }