RDMA/core: Fix GID entry ref leak when create_ah fails

BugLink: https://bugs.launchpad.net/bugs/2023328

[ Upstream commit aca3b0f ]

If AH create request fails, release sgid_attr to avoid GID entry
referrence leak reported while releasing GID table

Fixes: 1a1f460 ("RDMA: Hold the sgid_attr inside the struct ib_ah/qp")
Link: https://lore.kernel.org/r/[email protected]
Reviewed-by: Selvin Xavier <[email protected]>
Signed-off-by: Saravanan Vajravel <[email protected]>
Signed-off-by: Jason Gunthorpe <[email protected]>
Signed-off-by: Sasha Levin <[email protected]>
Signed-off-by: Kamal Mostafa <[email protected]>
Signed-off-by: Luke Nowakowski-Krijger <[email protected]>

Author: Saravanan Vajravel

drivers/infiniband/core/verbs.c

@@ -540,6 +540,8 @@ static struct ib_ah *_rdma_create_ah(struct ib_pd *pd,
 	else
 		ret = device->ops.create_ah(ah, &init_attr, NULL);
 	if (ret) {
+		if (ah->sgid_attr)
+			rdma_put_gid_attr(ah->sgid_attr);
 		kfree(ah);
 		return ERR_PTR(ret);
 	}