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: [] <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 products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
Linux Linux
Default version status: unaffected
4cbf8ac2fe5a0846508fe02b95a5de1a90fa73f4 to < 456bc338871c4a52117dd5ef29cce3745456d248affected4cbf8ac2fe5a0846508fe02b95a5de1a90fa73f4 to < 35fcb2ba35b4d9b592b558c3bcc6e0d90e213588affected4cbf8ac2fe5a0846508fe02b95a5de1a90fa73f4 to < e52910e671f58c619e33dac476b11b35e2d3ab6faffected4cbf8ac2fe5a0846508fe02b95a5de1a90fa73f4 to < cb8092d70a6f5f01ec1490fce4d35efed3ed996caffected0b8f0026bbd4df1688e1726026476e60762daf2aaffected5.4.287 to < 5.5affected
Linux Linux
Default version status: affected
5.5affected0 to < 5.5unaffected5.10.129 to ≤ 5.10.*unaffected5.15.53 to ≤ 5.15.*unaffected5.18.10 to ≤ 5.18.*unaffected5.19 to ≤ *unaffected