Description
In the Linux kernel, the following vulnerability has been resolved: can: netlink: can_changelink(): fix NULL pointer deref of struct can_priv::do_set_mode Andrei Lalaev reported a NULL pointer deref when a CAN device is restarted from Bus Off and the driver does not implement the struct can_priv::do_set_mode callback. There are 2 code path that call struct can_priv::do_set_mode: - directly by a manual restart from the user space, via can_changelink() - delayed automatic restart after bus off (deactivated by default) To prevent the NULL pointer deference, refuse a manual restart or configure the automatic restart delay in can_changelink() and report the error via extack to user space. As an additional safety measure let can_restart() return an error if can_priv::do_set_mode is not set instead of dereferencing it unchecked.
Product status
39549eef3587f1c1e8c65c88a2400d10fd30ea17 before 6bbcf37c5114926c99a1d1e6993a5b35689d2599
39549eef3587f1c1e8c65c88a2400d10fd30ea17 before cf81a60a973358dea163f6b14062f17831ceb894
39549eef3587f1c1e8c65c88a2400d10fd30ea17 before 0ca816a96fdcf32644c80cbe7a82c7b6ce6ddda5
39549eef3587f1c1e8c65c88a2400d10fd30ea17 before 6acceb46180f9e160d4f0c56fcaf39ba562822ae
39549eef3587f1c1e8c65c88a2400d10fd30ea17 before c1f3f9797c1f44a762e6f5f72520b2e520537b52
2.6.31
Any version before 2.6.31
6.1.148
6.6.101
6.12.41
6.15.9
6.16
References
git.kernel.org/...c/6bbcf37c5114926c99a1d1e6993a5b35689d2599
git.kernel.org/...c/cf81a60a973358dea163f6b14062f17831ceb894
git.kernel.org/...c/0ca816a96fdcf32644c80cbe7a82c7b6ce6ddda5
git.kernel.org/...c/6acceb46180f9e160d4f0c56fcaf39ba562822ae
git.kernel.org/...c/c1f3f9797c1f44a762e6f5f72520b2e520537b52
