From: Artem Chernyshev artem.chernyshev@red-soft.ru

stable inclusion from stable-v5.10.198 commit f515112e833791001aaa8ab886af3ca78503617f category: bugfix bugzilla: https://gitee.com/src-openeuler/kernel/issues/I95ATK CVE: CVE-2023-52573

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=...

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[ Upstream commit f1d95df0f31048f1c59092648997686e3f7d9478 ]

In rds_rdma_cm_event_handler_cmn() check, if conn pointer exists before dereferencing it as rdma_set_service_type() argument

Found by Linux Verification Center (linuxtesting.org) with SVACE.

Fixes: fd261ce6a30e ("rds: rdma: update rdma transport for tos") Signed-off-by: Artem Chernyshev artem.chernyshev@red-soft.ru Signed-off-by: David S. Miller davem@davemloft.net Signed-off-by: Sasha Levin sashal@kernel.org Signed-off-by: Zhengchao Shao shaozhengchao@huawei.com --- net/rds/rdma_transport.c | 8 +++++--- 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/net/rds/rdma_transport.c b/net/rds/rdma_transport.c index 5f741e51b4ba..bb38124a5d3d 100644 --- a/net/rds/rdma_transport.c +++ b/net/rds/rdma_transport.c @@ -86,10 +86,12 @@ static int rds_rdma_cm_event_handler_cmn(struct rdma_cm_id *cm_id, break;

case RDMA_CM_EVENT_ADDR_RESOLVED: - rdma_set_service_type(cm_id, conn->c_tos); - /* XXX do we need to clean up if this fails? */ - ret = rdma_resolve_route(cm_id, + if (conn) { + rdma_set_service_type(cm_id, conn->c_tos); + /* XXX do we need to clean up if this fails? */ + ret = rdma_resolve_route(cm_id, RDS_RDMA_RESOLVE_TIMEOUT_MS); + } break;

case RDMA_CM_EVENT_ROUTE_RESOLVED: