Description (CNA)
In the Linux kernel, the following vulnerability has been resolved: rds: ib: reject FRMR registration before IB connection is established rds_ib_get_mr() extracts the rds_ib_connection from conn->c_transport_data and passes it to rds_ib_reg_frmr() for FRWR memory registration. On a fresh outgoing connection, ic is allocated in rds_ib_conn_alloc() with i_cm_id = NULL because the connection worker has not yet called rds_ib_conn_path_connect() to create the rdma_cm_id. When sendmsg() with RDS_CMSG_RDMA_MAP is called on such a connection, the sendmsg path parses the control message before any connection establishment, allowing rds_ib_post_reg_frmr() to dereference ic->i_cm_id->qp and crash the kernel. The existing guard in rds_ib_reg_frmr() only checks for !ic (added in commit 9e630bcb7701), which does not catch this case since ic is allocated early and is always non-NULL once the connection object exists. KASAN: null-ptr-deref in range [0x0000000000000010-0x0000000000000017] RIP: 0010:rds_ib_post_reg_frmr+0x50e/0x920 Call Trace: rds_ib_post_reg_frmr (net/rds/ib_frmr.c:167) rds_ib_map_frmr (net/rds/ib_frmr.c:252) rds_ib_reg_frmr (net/rds/ib_frmr.c:430) rds_ib_get_mr (net/rds/ib_rdma.c:615) __rds_rdma_map (net/rds/rdma.c:295) rds_cmsg_rdma_map (net/rds/rdma.c:860) rds_sendmsg (net/rds/send.c:1363) ____sys_sendmsg do_syscall_64 Add a check in rds_ib_get_mr() that verifies ic, i_cm_id, and qp are all non-NULL before proceeding with FRMR registration, mirroring the guard already present in rds_ib_post_inv(). Return -ENODEV when the connection is not ready, which the existing error handling in rds_cmsg_send() converts to -EAGAIN for userspace retry and triggers rds_conn_connect_if_down() to start the connection worker.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected 1659185fb4d0025835eb2058a141f0746c5cab00 before c506456ebf84c50ed9327473d4e9bd905def212b; affected 1659185fb4d0025835eb2058a141f0746c5cab00 before 82e4a3b56b23b844802056c9e75a39d24169b0a4; affected 1659185fb4d0025835eb2058a141f0746c5cab00 before 450ec93c0f172374acbf236f1f5f02d53650aa2d; affected 1659185fb4d0025835eb2058a141f0746c5cab00 before 6b0a8de67ac0c74e1a7df92b73c862cb36780dfc; affected 1659185fb4d0025835eb2058a141f0746c5cab00 before a5bfd14c9a299e6db4add4440430ee5e010b03ad; affected 1659185fb4d0025835eb2058a141f0746c5cab00 before 23e07c340c445f0ebff7757ba15434cb447eb662; affected 1659185fb4d0025835eb2058a141f0746c5cab00 before 47de5b73db3b88f45c107393f26aeba26e9e8fae; affected 1659185fb4d0025835eb2058a141f0746c5cab00 before a54ecccfae62c5c85259ae5ea5d9c20009519049 |
| Linux / Linux | affected 4.6; unaffected 0 before 4.6; unaffected 5.10.253 through 5.10.*; unaffected 5.15.203 through 5.15.*; unaffected 6.1.168 through 6.1.*; unaffected 6.6.134 through 6.6.*; unaffected 6.12.81 through 6.12.*; unaffected 6.18.22 through 6.18.*; unaffected 6.19.12 through 6.19.*; unaffected 7.0 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/c506456ebf84c50ed9327473d4e9bd905def212b
- https://git.kernel.org/stable/c/82e4a3b56b23b844802056c9e75a39d24169b0a4
- https://git.kernel.org/stable/c/450ec93c0f172374acbf236f1f5f02d53650aa2d
- https://git.kernel.org/stable/c/6b0a8de67ac0c74e1a7df92b73c862cb36780dfc
- https://git.kernel.org/stable/c/a5bfd14c9a299e6db4add4440430ee5e010b03ad
- https://git.kernel.org/stable/c/23e07c340c445f0ebff7757ba15434cb447eb662
- https://git.kernel.org/stable/c/47de5b73db3b88f45c107393f26aeba26e9e8fae
- https://git.kernel.org/stable/c/a54ecccfae62c5c85259ae5ea5d9c20009519049