Description (CNA)
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: [] <IRQ> [] 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 "real", the bc link creation should also be called before it's rehashed, as we don't create it for preliminary nodes.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected 4cbf8ac2fe5a0846508fe02b95a5de1a90fa73f4 before 456bc338871c4a52117dd5ef29cce3745456d248; affected 4cbf8ac2fe5a0846508fe02b95a5de1a90fa73f4 before 35fcb2ba35b4d9b592b558c3bcc6e0d90e213588; affected 4cbf8ac2fe5a0846508fe02b95a5de1a90fa73f4 before e52910e671f58c619e33dac476b11b35e2d3ab6f; affected 4cbf8ac2fe5a0846508fe02b95a5de1a90fa73f4 before cb8092d70a6f5f01ec1490fce4d35efed3ed996c; affected 0b8f0026bbd4df1688e1726026476e60762daf2a; affected 5.4.287 before 5.5 |
| Linux / Linux | affected 5.5; unaffected 0 before 5.5; unaffected 5.10.129 through 5.10.*; unaffected 5.15.53 through 5.15.*; unaffected 5.18.10 through 5.18.*; unaffected 5.19 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/456bc338871c4a52117dd5ef29cce3745456d248
- https://git.kernel.org/stable/c/35fcb2ba35b4d9b592b558c3bcc6e0d90e213588
- https://git.kernel.org/stable/c/e52910e671f58c619e33dac476b11b35e2d3ab6f
- https://git.kernel.org/stable/c/cb8092d70a6f5f01ec1490fce4d35efed3ed996c
ADP enrichment
No English description supplied.
No references supplied.