[PATCH 5.19 0820/1157] RDMA/irdma: Fix a window for use-after-free

Greg Kroah-Hartman
2022-08-16T00:24:28Z

From: Mustafa Ismail <mustafa.ismail@intel.com>

[ Upstream commit 8ecef7890b3aea78c8bbb501a4b5b8134367b821 ]

During a destroy CQ an interrupt may cause processing of a CQE after CQ
resources are freed by irdma_cq_free_rsrc(). Fix this by moving the call
to irdma_cq_free_rsrc() after the irdma_sc_cleanup_ceqes(), which is
called under the cq_lock.

Fixes: b48c24c2d710 ("RDMA/irdma: Implement device supported verb APIs")
Link: https://lore.kernel.org/r/20220705230815.265-6-shiraz.saleem@intel.com
Signed-off-by: Bartosz Sobczak <bartosz.sobczak@intel.com>
Signed-off-by: Mustafa Ismail <mustafa.ismail@intel.com>
Signed-off-by: Shiraz Saleem <shiraz.saleem@intel.com>
Signed-off-by: Leon Romanovsky <leon@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/infiniband/hw/irdma/verbs.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/infiniband/hw/irdma/verbs.c b/drivers/infiniband/hw/irdma/verbs.c
index 96135a228f26..227a799385d1 100644
--- a/drivers/infiniband/hw/irdma/verbs.c
+++ b/drivers/infiniband/hw/irdma/verbs.c
@@ -1776,11 +1776,11 @@ static int irdma_destroy_cq(struct ib_cq *ib_cq, struct ib_udata *udata)
spin_unlock_irqrestore(&iwcq->lock, flags);

irdma_cq_wq_destroy(iwdev->rf, cq);
- irdma_cq_free_rsrc(iwdev->rf, iwcq);

spin_lock_irqsave(&iwceq->ce_lock, flags);
irdma_sc_cleanup_ceqes(cq, ceq);
spin_unlock_irqrestore(&iwceq->ce_lock, flags);
+ irdma_cq_free_rsrc(iwdev->rf, iwcq);

return 0;
}
--
2.35.1