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Subject: media: dvb-core: Fix double free in dvb_register_device() Author: Keita Suzuki keitasuzuki.park@sslab.ics.keio.ac.jp Date: Tue Apr 26 06:29:19 2022 +0100
In function dvb_register_device() -> dvb_register_media_device() -> dvb_create_media_entity(), dvb->entity is allocated and initialized. If the initialization fails, it frees the dvb->entity, and return an error code. The caller takes the error code and handles the error by calling dvb_media_device_free(), which unregisters the entity and frees the field again if it is not NULL. As dvb->entity may not NULLed in dvb_create_media_entity() when the allocation of dvbdev->pad fails, a double free may occur. This may also cause an Use After free in media_device_unregister_entity().
Fix this by storing NULL to dvb->entity when it is freed.
Link: https://lore.kernel.org/linux-media/20220426052921.2088416-1-keitasuzuki.par... Fixes: fcd5ce4b3936 ("media: dvb-core: fix a memory leak bug") Cc: stable@vger.kernel.org Cc: Wenwen Wang wenwen@cs.uga.edu Signed-off-by: Keita Suzuki keitasuzuki.park@sslab.ics.keio.ac.jp Signed-off-by: Mauro Carvalho Chehab mchehab@kernel.org
drivers/media/dvb-core/dvbdev.c | 1 + 1 file changed, 1 insertion(+)
---
diff --git a/drivers/media/dvb-core/dvbdev.c b/drivers/media/dvb-core/dvbdev.c index d5a142ef9876..5b275a9395c1 100644 --- a/drivers/media/dvb-core/dvbdev.c +++ b/drivers/media/dvb-core/dvbdev.c @@ -333,6 +333,7 @@ static int dvb_create_media_entity(struct dvb_device *dvbdev, GFP_KERNEL); if (!dvbdev->pads) { kfree(dvbdev->entity); + dvbdev->entity = NULL; return -ENOMEM; } }