CVE-2022-49664 Information

Description

In the Linux kernel the following vulnerability has been resolved:

tipc: move bc link creation back to tipc_node_create

Shuang Li reported a NULL pointer dereference crash:

[] BUG: kernel NULL pointer dereference address: 0000000000000068 [] RIP: 0010:tipc_link_is_up+0x5/0x10 [tipc] [] Call Trace: [] [] tipc_bcast_rcv+0xa2/0x190 [tipc] [] tipc_node_bc_rcv+0x8b/0x200 [tipc] [] tipc_rcv+0x3af/0x5b0 [tipc] [] tipc_udp_recv+0xc7/0x1e0 [tipc]

It was caused by the ’l’ passed into tipc_bcast_rcv() is NULL. When it creates a node in tipc_node_check_dest() after inserting the new node into hashtable in tipc_node_create() it creates the bc link. However there is a gap between this insert and bc link creation a bc packet may come in and get the node from the hashtable then try to dereference its bc link which is NULL.

This patch is to fix it by moving the bc link creation before inserting into the hashtable.

Note that for a preliminary node becoming eal\ the bc link creation should also be called before it’s rehashed as we don’t create it for preliminary nodes.

Reference

https://git.kernel.org/stable/c/35fcb2ba35b4d9b592b558c3bcc6e0d90e213588 https://git.kernel.org/stable/c/456bc338871c4a52117dd5ef29cce3745456d248 https://git.kernel.org/stable/c/cb8092d70a6f5f01ec1490fce4d35efed3ed996c https://git.kernel.org/stable/c/e52910e671f58c619e33dac476b11b35e2d3ab6f