This is a note to let you know that I've just added the patch titled
media: dvbdev: fix error logic at dvb_register_device()
to the 4.19-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
media-dvbdev-fix-error-logic-at-dvb_register_device.patch
and it can be found in the queue-4.19 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 35d2fb9d66a9ac9141721ddc49db808facd69469
Author: Mauro Carvalho Chehab <mchehab+huawei@xxxxxxxxxx>
Date: Wed Jun 9 14:32:29 2021 +0200
media: dvbdev: fix error logic at dvb_register_device()
[ Upstream commit 1fec2ecc252301110e4149e6183fa70460d29674 ]
As reported by smatch:
drivers/media/dvb-core/dvbdev.c: drivers/media/dvb-core/dvbdev.c:510 dvb_register_device() warn: '&dvbdev->list_head' not removed from list
drivers/media/dvb-core/dvbdev.c: drivers/media/dvb-core/dvbdev.c:530 dvb_register_device() warn: '&dvbdev->list_head' not removed from list
drivers/media/dvb-core/dvbdev.c: drivers/media/dvb-core/dvbdev.c:545 dvb_register_device() warn: '&dvbdev->list_head' not removed from list
The error logic inside dvb_register_device() doesn't remove
devices from the dvb_adapter_list in case of errors.
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@xxxxxxxxxx>
Stable-dep-of: 8c64f4cdf4e6 ("media: edia: dvbdev: fix a use-after-free")
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/media/dvb-core/dvbdev.c b/drivers/media/dvb-core/dvbdev.c
index 8273c969358e6..cf0c428f5776b 100644
--- a/drivers/media/dvb-core/dvbdev.c
+++ b/drivers/media/dvb-core/dvbdev.c
@@ -513,6 +513,7 @@ int dvb_register_device(struct dvb_adapter *adap, struct dvb_device **pdvbdev,
break;
if (minor == MAX_DVB_MINORS) {
+ list_del (&dvbdev->list_head);
kfree(dvbdevfops);
kfree(dvbdev);
up_write(&minor_rwsem);
@@ -533,6 +534,7 @@ int dvb_register_device(struct dvb_adapter *adap, struct dvb_device **pdvbdev,
__func__);
dvb_media_device_free(dvbdev);
+ list_del (&dvbdev->list_head);
kfree(dvbdevfops);
kfree(dvbdev);
mutex_unlock(&dvbdev_register_lock);
@@ -548,6 +550,7 @@ int dvb_register_device(struct dvb_adapter *adap, struct dvb_device **pdvbdev,
pr_err("%s: failed to create device dvb%d.%s%d (%ld)\n",
__func__, adap->num, dnames[type], id, PTR_ERR(clsdev));
dvb_media_device_free(dvbdev);
+ list_del (&dvbdev->list_head);
kfree(dvbdevfops);
kfree(dvbdev);
return PTR_ERR(clsdev);
