CVE-2022-48972

In the Linux kernel, the following vulnerability has been resolved:

mac802154: fix missing INIT_LIST_HEAD in ieee802154_if_add()

Kernel fault injection test reports null-ptr-deref as follows:

BUG: kernel NULL pointer dereference, address: 0000000000000008 RIP: 0010:cfg802154_netdev_notifier_call+0x120/0x310 include/linux/list.h:114 Call Trace: raw_notifier_call_chain+0x6d/0xa0 kernel/notifier.c:87 call_netdevice_notifiers_info+0x6e/0xc0 net/core/dev.c:1944 unregister_netdevice_many_notify+0x60d/0xcb0 net/core/dev.c:1982 unregister_netdevice_queue+0x154/0x1a0 net/core/dev.c:10879 register_netdevice+0x9a8/0xb90 net/core/dev.c:10083 ieee802154_if_add+0x6ed/0x7e0 net/mac802154/iface.c:659 ieee802154_register_hw+0x29c/0x330 net/mac802154/main.c:229 mcr20a_probe+0xaaa/0xcb1 drivers/net/ieee802154/mcr20a.c:1316

ieee802154_if_add() allocates wpan_dev as netdevs private data, but not init the list in struct wpan_dev. cfg802154_netdev_notifier_call() manage the list when device register/unregister, and may lead to null-ptr-deref.

Use INIT_LIST_HEAD() on it to initialize it correctly.

Weakness

A NULL pointer dereference occurs when the application dereferences a pointer that it expects to be valid, but is NULL, typically causing a crash or exit.

Affected Software

Potential Mitigations

References

• https://git.kernel.org/stable/c/1831d4540406708e48239cf38fd9c3b7ea98e08f
• https://git.kernel.org/stable/c/42c319635c0cf7eb36eccac6cda76532f47b61a3
• https://git.kernel.org/stable/c/623918f40fa68e3bb21312a3fafb90f491bf5358
• https://git.kernel.org/stable/c/7410f4d1221bb182510b7778ab6eefa8b9b7102d
• https://git.kernel.org/stable/c/9980a3ea20de40c83817877106c909cb032692d2
• https://git.kernel.org/stable/c/a110287ef4a423980309490df632e1c1e73b3dc9
• https://git.kernel.org/stable/c/b3d72d3135d2ef68296c1ee174436efd65386f04
• https://git.kernel.org/stable/c/f00c84fb1635c27ba24ec5df65d5bd7d7dc00008