[PATCH 5.16 0573/1017] RDMA/core: Fix ib_qp_usecnt_dec() called when error

Greg Kroah-Hartman
2022-04-05T12:58:36Z

From: Yajun Deng <yajun.deng@linux.dev>

[ Upstream commit 7c4a539ec38f4ce400a0f3fcb5ff6c940fcd67bb ]

ib_destroy_qp() would called by ib_create_qp_user() if error, the former
contains ib_qp_usecnt_dec(), but ib_qp_usecnt_inc() was not called before.

So move ib_qp_usecnt_inc() into create_qp().

Fixes: d2b10794fc13 ("RDMA/core: Create clean QP creations interface for uverbs")
Link: https://lore.kernel.org/r/20220303024232.2847388-1-yajun.deng@linux.dev
Signed-off-by: Yajun Deng <yajun.deng@linux.dev>
Reviewed-by: Leon Romanovsky <leonro@nvidia.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/infiniband/core/uverbs_cmd.c | 1 -
drivers/infiniband/core/uverbs_std_types_qp.c | 1 -
drivers/infiniband/core/verbs.c | 3 +--
3 files changed, 1 insertion(+), 4 deletions(-)

diff --git a/drivers/infiniband/core/uverbs_cmd.c b/drivers/infiniband/core/uverbs_cmd.c
index d1345d76d9b1..5a99e31df5f5 100644
--- a/drivers/infiniband/core/uverbs_cmd.c
+++ b/drivers/infiniband/core/uverbs_cmd.c
@@ -1438,7 +1438,6 @@ static int create_qp(struct uverbs_attr_bundle *attrs,
ret = PTR_ERR(qp);
goto err_put;
}
- ib_qp_usecnt_inc(qp);

obj->uevent.uobject.object = qp;
obj->uevent.event_file = READ_ONCE(attrs->ufile->default_async_file);
diff --git a/drivers/infiniband/core/uverbs_std_types_qp.c b/drivers/infiniband/core/uverbs_std_types_qp.c
index dd1075466f61..75353e09c6fe 100644
--- a/drivers/infiniband/core/uverbs_std_types_qp.c
+++ b/drivers/infiniband/core/uverbs_std_types_qp.c
@@ -254,7 +254,6 @@ static int UVERBS_HANDLER(UVERBS_METHOD_QP_CREATE)(
ret = PTR_ERR(qp);
goto err_put;
}
- ib_qp_usecnt_inc(qp);

if (attr.qp_type == IB_QPT_XRC_TGT) {
obj->uxrcd = container_of(xrcd_uobj, struct ib_uxrcd_object,
diff --git a/drivers/infiniband/core/verbs.c b/drivers/infiniband/core/verbs.c
index e821dc94a43e..961055eb330d 100644
--- a/drivers/infiniband/core/verbs.c
+++ b/drivers/infiniband/core/verbs.c
@@ -1253,6 +1253,7 @@ static struct ib_qp *create_qp(struct ib_device *dev, struct ib_pd *pd,
if (ret)
goto err_security;

+ ib_qp_usecnt_inc(qp);
rdma_restrack_add(&qp->res);
return qp;

@@ -1353,8 +1354,6 @@ struct ib_qp *ib_create_qp_kernel(struct ib_pd *pd,
if (IS_ERR(qp))
return qp;

- ib_qp_usecnt_inc(qp);
-
if (qp_init_attr->cap.max_rdma_ctxs) {
ret = rdma_rw_init_mrs(qp, qp_init_attr);
if (ret)
--
2.34.1