From: Gerd Rausch gerd.rausch@oracle.com

stable inclusion from stable-v4.19.198 commit 4893c938f2a140a74be91779e45e4a7fa111198f category: bugfix bugzilla: https://gitee.com/src-openeuler/kernel/issues/I9R4ER CVE: CVE-2021-47345

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=...

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[ 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 Signed-off-by: Zhao Wenhui zhaowenhui8@huawei.com --- drivers/infiniband/core/cma.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/infiniband/core/cma.c b/drivers/infiniband/core/cma.c index 20a5501b740a..127ebd481689 100644 --- a/drivers/infiniband/core/cma.c +++ b/drivers/infiniband/core/cma.c @@ -2547,7 +2547,8 @@ static int cma_resolve_ib_route(struct rdma_id_private *id_priv, int timeout_ms)

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;