Description
In the Linux kernel, the following vulnerability has been resolved: can: j1939: make j1939_session_activate() fail if device is no longer registered syzbot is still reporting unregister_netdevice: waiting for vcan0 to become free. Usage count = 2 even after commit 93a27b5891b8 ("can: j1939: add missing calls in NETDEV_UNREGISTER notification handler") was added. A debug printk() patch found that j1939_session_activate() can succeed even after j1939_cancel_active_session() from j1939_netdev_notify(NETDEV_UNREGISTER) has completed. Since j1939_cancel_active_session() is processed with the session list lock held, checking ndev->reg_state in j1939_session_activate() with the session list lock held can reliably close the race window.
Product status
9d71dd0c70099914fcd063135da3c580865e924c (git) before ebb0dfd718dd31c8d3600612ca4b7207ec3d923a
9d71dd0c70099914fcd063135da3c580865e924c (git) before c3a4316e3c746af415c0fd6c6d489ad13f53714d
9d71dd0c70099914fcd063135da3c580865e924c (git) before 46ca9dc978923c5e1247a9e9519240ba7ace413c
9d71dd0c70099914fcd063135da3c580865e924c (git) before 78d87b72cebe2a993fd5b017e9f14fb6278f2eae
9d71dd0c70099914fcd063135da3c580865e924c (git) before ba6f0d1832eeb5eb3a6dc5cb30e0f720b3cb3536
9d71dd0c70099914fcd063135da3c580865e924c (git) before 79dd3f1d9dd310c2af89b09c71f34d93973b200f
9d71dd0c70099914fcd063135da3c580865e924c (git) before 5d5602236f5db19e8b337a2cd87a90ace5ea776d
5.4
Any version before 5.4
5.10.248 (semver)
5.15.198 (semver)
6.1.161 (semver)
6.6.121 (semver)
6.12.66 (semver)
6.18.6 (semver)
6.19 (original_commit_for_fix)
References
git.kernel.org/...c/ebb0dfd718dd31c8d3600612ca4b7207ec3d923a
git.kernel.org/...c/c3a4316e3c746af415c0fd6c6d489ad13f53714d
git.kernel.org/...c/46ca9dc978923c5e1247a9e9519240ba7ace413c
git.kernel.org/...c/78d87b72cebe2a993fd5b017e9f14fb6278f2eae
git.kernel.org/...c/ba6f0d1832eeb5eb3a6dc5cb30e0f720b3cb3536
git.kernel.org/...c/79dd3f1d9dd310c2af89b09c71f34d93973b200f
git.kernel.org/...c/5d5602236f5db19e8b337a2cd87a90ace5ea776d