From: Jason Gunthorpe jgg@nvidia.com
stable inclusion from linux-4.19.153 commit 0beef934d50822b1cb884f1e7bb115fe0a36a974
prepare for fixing CVE-2021-32078 --------------------------------
[ Upstream commit 38e03d092699891c3237b5aee9e8029d4ede0956 ]
All entry points to the rdma_cm from a ULP must be single threaded, even this error unwinds. Add the missing locking.
Fixes: 7c11910783a1 ("RDMA/ucma: Put a lock around every call to the rdma_cm layer") Link: https://lore.kernel.org/r/20200818120526.702120-11-leon@kernel.org Signed-off-by: Leon Romanovsky leonro@mellanox.com Signed-off-by: Jason Gunthorpe jgg@nvidia.com Signed-off-by: Sasha Levin sashal@kernel.org Signed-off-by: Yang Yingliang yangyingliang@huawei.com --- drivers/infiniband/core/ucma.c | 2 ++ 1 file changed, 2 insertions(+)
diff --git a/drivers/infiniband/core/ucma.c b/drivers/infiniband/core/ucma.c index 0c095c8c0ac5b..01052de6bedbf 100644 --- a/drivers/infiniband/core/ucma.c +++ b/drivers/infiniband/core/ucma.c @@ -1476,7 +1476,9 @@ static ssize_t ucma_process_join(struct ucma_file *file, return 0;
err3: + mutex_lock(&ctx->mutex); rdma_leave_multicast(ctx->cm_id, (struct sockaddr *) &mc->addr); + mutex_unlock(&ctx->mutex); ucma_cleanup_mc_events(mc); err2: mutex_lock(&mut);