[PATCH 5.10/5.15] RDMA/rxe: Fix the error "trying to register non-static key in rxe_cleanup_task"

[Vladislav Nikolaev <vlad102nikolaev@gmail.com>]

From: Zhu Yanjun <yanjun.zhu@linux.dev>

commit b2b1ddc457458fecd1c6f385baa9fbda5f0c63ad upstream.

In the function rxe_create_qp(), rxe_qp_from_init() is called to
initialize qp, internally things like rxe_init_task are not setup until
rxe_qp_init_req().

If an error occurred before this point then the unwind will call
rxe_cleanup() and eventually to rxe_qp_do_cleanup()/rxe_cleanup_task()
which will oops when trying to access the uninitialized spinlock.

If rxe_init_task is not executed, rxe_cleanup_task will not be called.

Reported-by: syzbot+cfcc1a3c85be15a40cba@syzkaller.appspotmail.com
Link: https://syzkaller.appspot.com/bug?id=fd85757b74b3eb59f904138486f755f71e090df8
Fixes: 8700e3e7c485 ("Soft RoCE driver")
Fixes: 2d4b21e0a291 ("IB/rxe: Prevent from completer to operate on non valid QP")
Signed-off-by: Zhu Yanjun <yanjun.zhu@linux.dev>
Link: https://lore.kernel.org/r/20230413101115.1366068-1-yanjun.zhu@intel.com
Signed-off-by: Leon Romanovsky <leon@kernel.org>
Signed-off-by: Vladislav Nikolaev <vlad102nikolaev@gmail.com>
---
Backport fix for CVE-2023-54028
 drivers/infiniband/sw/rxe/rxe_qp.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/drivers/infiniband/sw/rxe/rxe_qp.c b/drivers/infiniband/sw/rxe/rxe_qp.c
index 13b237d93a61..687d4419388f 100644
--- a/drivers/infiniband/sw/rxe/rxe_qp.c
+++ b/drivers/infiniband/sw/rxe/rxe_qp.c
@@ -785,8 +785,11 @@ void rxe_qp_destroy(struct rxe_qp *qp)
 		del_timer_sync(&qp->rnr_nak_timer);
 	}
 
-	rxe_cleanup_task(&qp->req.task);
-	rxe_cleanup_task(&qp->comp.task);
+	if (qp->req.task.func)
+		rxe_cleanup_task(&qp->req.task);
+
+	if (qp->comp.task.func)
+		rxe_cleanup_task(&qp->comp.task);
 
 	/* flush out any receive wr's or pending requests */
 	if (qp->req.task.func)
-- 
2.47.3