RDMA/siw: Fix refcounting leak in siw_create_qp()

BugLink: https://bugs.launchpad.net/bugs/1960516
commit a75badebfdc0b3823054bedf112edb54d6357c75 upstream.

The atomic_inc() needs to be paired with an atomic_dec() on the error
path.

Fixes: 514aee660df4 ("RDMA: Globally allocate and release QP memory")
Link: https://lore.kernel.org/r/20220118091104.GA11671@kili
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Reviewed-by: Leon Romanovsky <leonro@nvidia.com>
Reviewed-by: Bernard Metzler <bmt@zurich.ibm.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Paolo Pisati <paolo.pisati@canonical.com>

diff --git a/drivers/infiniband/sw/siw/siw_verbs.c b/drivers/infiniband/sw/siw/siw_verbs.c
index 1b36350601faaabc374207a4dce673894e1aad86..aa3f60d54a70f4713bada607dfcd7a5b946f3ce9 100644 (file)
--- a/drivers/infiniband/sw/siw/siw_verbs.c
+++ b/drivers/infiniband/sw/siw/siw_verbs.c
@@ -311,7 +311,8 @@ int siw_create_qp(struct ib_qp *ibqp, struct ib_qp_init_attr *attrs,
 
        if (atomic_inc_return(&sdev->num_qp) > SIW_MAX_QP) {
                siw_dbg(base_dev, "too many QP's\n");
-               return -ENOMEM;
+               rv = -ENOMEM;
+               goto err_atomic;
        }
        if (attrs->qp_type != IB_QPT_RC) {
                siw_dbg(base_dev, "only RC QP's supported\n");