CVE-2022-49862

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

tipc: fix the msg->req tlv len check in tipc_nl_compat_name_table_dump_header

This is a follow-up for commit 974cb0e3e7c9 (tipc: fix uninit-value in tipc_nl_compat_name_table_dump) where it should have type casted sizeof(..) to int to work when TLV_GET_DATA_LEN() returns a negative value.

syzbot reported a call trace because of it:

BUG: KMSAN: uninit-value in … tipc_nl_compat_name_table_dump+0x841/0xea0 net/tipc/netlink_compat.c:934 __tipc_nl_compat_dumpit+0xab2/0x1320 net/tipc/netlink_compat.c:238 tipc_nl_compat_dumpit+0x991/0xb50 net/tipc/netlink_compat.c:321 tipc_nl_compat_recv+0xb6e/0x1640 net/tipc/netlink_compat.c:1324 genl_family_rcv_msg_doit net/netlink/genetlink.c:731 [inline] genl_family_rcv_msg net/netlink/genetlink.c:775 [inline] genl_rcv_msg+0x103f/0x1260 net/netlink/genetlink.c:792 netlink_rcv_skb+0x3a5/0x6c0 net/netlink/af_netlink.c:2501 genl_rcv+0x3c/0x50 net/netlink/genetlink.c:803 netlink_unicast_kernel net/netlink/af_netlink.c:1319 [inline] netlink_unicast+0xf3b/0x1270 net/netlink/af_netlink.c:1345 netlink_sendmsg+0x1288/0x1440 net/netlink/af_netlink.c:1921 sock_sendmsg_nosec net/socket.c:714 [inline] sock_sendmsg net/socket.c:734 [inline]

Weakness

The product uses or accesses a resource that has not been initialized.

Affected Software

Potential Mitigations

References

• https://git.kernel.org/stable/c/082707d3df191bf5bb8801d43e4ce3dea39ca173
• https://git.kernel.org/stable/c/1c075b192fe41030457cd4a5f7dea730412bca40
• https://git.kernel.org/stable/c/301caa06091af4d5cf056ac8249cbda4e6029c6a
• https://git.kernel.org/stable/c/36769b9477491a7af6635863bd950309c1e1b96c
• https://git.kernel.org/stable/c/55a253a6753a603e80b95932ca971ba514aa6ce7
• https://git.kernel.org/stable/c/6cee2c60bd168279852ac7dbe54c2b70d1028644
• https://git.kernel.org/stable/c/a0ead1d648df9c456baec832b494513ef405949a
• https://git.kernel.org/stable/c/f31dd158580940938f77514b87337a777520185a