RDMA/cma: Fix rdma_resolve_route() memory leak

[ Upstream commit 74f160ead74bfe5f2b38afb4fcf86189f9ff40c9 ]

Fix a memory leak when "mda_resolve_route() is called more than once on
the same "rdma_cm_id".

This is possible if cma_query_handler() triggers the
RDMA_CM_EVENT_ROUTE_ERROR flow which puts the state machine back and
allows rdma_resolve_route() to be called again.

Link: https://lore.kernel.org/r/f6662b7b-bdb7-2706-1e12-47c61d3474b6@oracle.com
Signed-off-by: Gerd Rausch <gerd.rausch@oracle.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/infiniband/core/cma.c b/drivers/infiniband/core/cma.c
index 92428990f0ccc94d6035b83343c397fdb2c25c8a..ec9e9598894f6b036d85a3b6c48e33f17718fd6a 100644 (file)
--- a/drivers/infiniband/core/cma.c
+++ b/drivers/infiniband/core/cma.c
@@ -2719,7 +2719,8 @@ static int cma_resolve_ib_route(struct rdma_id_private *id_priv,
 
        cma_init_resolve_route_work(work, id_priv);
 
-       route->path_rec = kmalloc(sizeof *route->path_rec, GFP_KERNEL);
+       if (!route->path_rec)
+               route->path_rec = kmalloc(sizeof *route->path_rec, GFP_KERNEL);
        if (!route->path_rec) {
                ret = -ENOMEM;
                goto err1;